diff --git a/Gruntfile.js b/Gruntfile.js
index d64b071..6553cc5 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -29,7 +29,8 @@ var projs = [
   'tpers',
   'geos',
   'eqearth',
-  'bonne'
+  'bonne',
+  'ob_tran'
 ];
 module.exports = function (grunt) {
   grunt.initConfig({
diff --git a/lib/defs.js b/lib/defs.js
index 53332c0..e9809cc 100644
--- a/lib/defs.js
+++ b/lib/defs.js
@@ -38,6 +38,7 @@ import wkt from 'wkt-parser';
  * @property {number} [rectified_grid_angle]
  * @property {boolean} [approx]
  * @property {boolean} [over]
+ * @property {string} [projStr]
  * @property {<T extends import('./core').TemplateCoordinates>(coordinates: T, enforceAxis?: boolean) => T} inverse
  * @property {<T extends import('./core').TemplateCoordinates>(coordinates: T, enforceAxis?: boolean) => T} forward
  */
diff --git a/lib/includedProjections.js b/lib/includedProjections.js
index fa4da90..c6a740e 100644
--- a/lib/includedProjections.js
+++ b/lib/includedProjections.js
@@ -28,6 +28,7 @@ import tpers from './projections/tpers';
 import geos from './projections/geos';
 import eqearth from './projections/eqearth';
 import bonne from './projections/bonne';
+import ob_tran from './projections/ob_tran';
 
 var projs = [
   tmerc,
@@ -59,7 +60,8 @@ var projs = [
   tpers,
   geos,
   eqearth,
-  bonne
+  bonne,
+  ob_tran
 ];
 
 export default function (proj4) {
diff --git a/lib/projString.js b/lib/projString.js
index c9a6854..04eb138 100644
--- a/lib/projString.js
+++ b/lib/projString.js
@@ -146,5 +146,6 @@ export default function (defData) {
   if (typeof self.datumCode === 'string' && self.datumCode !== 'WGS84') {
     self.datumCode = self.datumCode.toLowerCase();
   }
+  self['projStr'] = defData;
   return self;
 }
diff --git a/lib/projections/eqearth.js b/lib/projections/eqearth.js
index de0a80e..1a330b0 100644
--- a/lib/projections/eqearth.js
+++ b/lib/projections/eqearth.js
@@ -38,6 +38,8 @@ var A1 = 1.340264,
 export function init() {
   this.es = 0;
   this.long0 = this.long0 !== undefined ? this.long0 : 0;
+  this.x0 = this.x0 !== undefined ? this.x0 : 0;
+  this.y0 = this.y0 !== undefined ? this.y0 : 0;
 }
 
 export function forward(p) {
diff --git a/lib/projections/moll.js b/lib/projections/moll.js
index ee860c9..912d028 100644
--- a/lib/projections/moll.js
+++ b/lib/projections/moll.js
@@ -1,6 +1,13 @@
 import adjust_lon from '../common/adjust_lon';
-export function init() {}
 import { EPSLN } from '../constants/values';
+
+/** @this {import('../defs.js').ProjectionDefinition} */
+export function init() {
+  this.x0 = this.x0 !== undefined ? this.x0 : 0;
+  this.y0 = this.y0 !== undefined ? this.y0 : 0;
+  this.long0 = this.long0 !== undefined ? this.long0 : 0;
+}
+
 /* Mollweide forward equations--mapping lat,long to x,y
     ---------------------------------------------------- */
 export function forward(p) {
diff --git a/lib/projections/ob_tran.js b/lib/projections/ob_tran.js
new file mode 100644
index 0000000..42369bf
--- /dev/null
+++ b/lib/projections/ob_tran.js
@@ -0,0 +1,347 @@
+import adjust_lon from '../common/adjust_lon';
+import { D2R, HALF_PI, EPSLN } from '../constants/values';
+import Proj from '../Proj';
+
+/**
+    Original projection implementation:
+        https://github.com/OSGeo/PROJ/blob/46c47e9adf6376ae06afabe5d24a0016a05ced82/src/projections/ob_tran.cpp
+
+    Documentation:
+        https://proj.org/operations/projections/ob_tran.html
+
+    References/Formulas:
+        https://pubs.usgs.gov/pp/1395/report.pdf
+
+    Examples:
+        +proj=ob_tran +o_proj=moll +o_lat_p=45 +o_lon_p=-90
+        +proj=ob_tran +o_proj=moll +o_lat_p=45 +o_lon_p=-90 +lon_0=60
+        +proj=ob_tran +o_proj=moll +o_lat_p=45 +o_lon_p=-90 +lon_0=-90
+*/
+
+const projectionType = {
+  OBLIQUE: {
+    forward: forwardOblique,
+    inverse: inverseOblique
+  },
+  TRANSVERSE: {
+    forward: forwardTransverse,
+    inverse: inverseTransverse
+  }
+};
+
+/**
+ * @typedef {Object} LocalThis
+ * @property {number} lamp
+ * @property {number} cphip
+ * @property {number} sphip
+ * @property {Object} projectionType
+ * @property {string | undefined} o_proj
+ * @property {string | undefined} o_lon_p
+ * @property {string | undefined} o_lat_p
+ * @property {string | undefined} o_alpha
+ * @property {string | undefined} o_lon_c
+ * @property {string | undefined} o_lat_c
+ * @property {string | undefined} o_lon_1
+ * @property {string | undefined} o_lat_1
+ * @property {string | undefined} o_lon_2
+ * @property {string | undefined} o_lat_2
+ * @property {number | undefined} oLongP
+ * @property {number | undefined} oLatP
+ * @property {number | undefined} oAlpha
+ * @property {number | undefined} oLongC
+ * @property {number | undefined} oLatC
+ * @property {number | undefined} oLong1
+ * @property {number | undefined} oLat1
+ * @property {number | undefined} oLong2
+ * @property {number | undefined} oLat2
+ * @property {import('..').Converter} obliqueProjection
+ *
+ */
+
+/**
+ *    Parameters can be from the following sets:
+ *       New pole --> o_lat_p, o_lon_p
+ *       Rotate about point --> o_alpha, o_lon_c, o_lat_c
+ *       New equator points --> lon_1, lat_1, lon_2, lat_2
+ *
+ *    Per the original source code, the parameter sets are
+ *    checked in the order of the object below.
+ */
+const paramSets = {
+  ROTATE: {
+    o_alpha: 'oAlpha',
+    o_lon_c: 'oLongC',
+    o_lat_c: 'oLatC'
+  },
+  NEW_POLE: {
+    o_lat_p: 'oLatP',
+    o_lon_p: 'oLongP'
+  },
+  NEW_EQUATOR: {
+    o_lon_1: 'oLong1',
+    o_lat_1: 'oLat1',
+    o_lon_2: 'oLong2',
+    o_lat_2: 'oLat2'
+  }
+};
+
+/** @this {import('../defs.js').ProjectionDefinition & LocalThis} */
+export function init() {
+  this.x0 = this.x0 || 0;
+  this.y0 = this.y0 || 0;
+  this.long0 = this.long0 || 0;
+  this.title = this.title || 'General Oblique Transformation';
+
+  /** Verify required parameters exist */
+  if (!this.o_proj) {
+    throw new Error('Missing parameter: o_proj');
+  }
+
+  if (this.o_proj === `ob_tran`) {
+    throw new Error('Invalid value for o_proj: ' + this.o_proj);
+  }
+
+  const newProjStr = this.projStr.replace('+proj=ob_tran', '').replace('+o_proj=', '+proj=').trim();
+
+  /** @type {import('../defs.js').ProjectionDefinition} */
+  const oProj = Proj(newProjStr);
+  if (!oProj) {
+    throw new Error('Invalid parameter: o_proj. Unknown projection ' + this.o_proj);
+  }
+  oProj.long0 = 0; // we handle long0 before/after forward/inverse
+  this.obliqueProjection = oProj;
+
+  let matchedSet;
+  const paramSetsKeys = Object.keys(paramSets);
+
+  /**
+   * parse strings, convert to radians, throw on NaN
+   * @param {string} name
+   * @returns {number | undefined}
+   */
+  const parseParam = (name) => {
+    if (typeof this[name] === `undefined`) {
+      return undefined;
+    }
+    const val = parseFloat(this[name]) * D2R;
+    if (isNaN(val)) {
+      throw new Error('Invalid value for ' + name + ': ' + this[name]);
+    }
+    return val;
+  };
+
+  for (let i = 0; i < paramSetsKeys.length; i++) {
+    const setKey = paramSetsKeys[i];
+    const set = paramSets[setKey];
+    const params = Object.entries(set);
+    const setHasParams = params.some(
+      ([p]) => typeof this[p] !== 'undefined'
+    );
+    if (!setHasParams) {
+      continue;
+    }
+    matchedSet = set;
+    for (let ii = 0; ii < params.length; ii++) {
+      const [inputParam, param] = params[ii];
+      const val = parseParam(inputParam);
+      if (typeof val === 'undefined') {
+        throw new Error('Missing parameter: ' + inputParam + '.');
+      }
+      this[param] = val;
+    }
+    break;
+  }
+
+  if (!matchedSet) {
+    throw new Error('No valid parameters provided for ob_tran projection.');
+  }
+
+  const { lamp, phip } = createRotation(this, matchedSet);
+  this.lamp = lamp;
+
+  if (Math.abs(phip) > EPSLN) {
+    this.cphip = Math.cos(phip);
+    this.sphip = Math.sin(phip);
+    this.projectionType = projectionType.OBLIQUE;
+  } else {
+    this.projectionType = projectionType.TRANSVERSE;
+  }
+}
+
+// ob_tran forward equations--mapping (lat,long) to (x,y)
+// transverse (90 degrees from normal orientation) - forwardTransverse
+// or oblique (arbitrary angle) used based on parameters - forwardOblique
+// -----------------------------------------------------------------
+/** @this {import('../defs.js').ProjectionDefinition & LocalThis} */
+export function forward(p) {
+  return this.projectionType.forward(this, p);
+}
+
+// inverse equations--mapping (x,y) to (lat,long)
+// transverse: inverseTransverse
+// oblique: inverseOblique
+// -----------------------------------------------------------------
+/** @this {import('../defs.js').ProjectionDefinition & LocalThis} */
+export function inverse(p) {
+  return this.projectionType.inverse(this, p);
+}
+
+/**
+ * @param {import('../defs.js').ProjectionDefinition & LocalThis} params - Initialized projection definition
+ * @param {Object} how - Transformation method
+ * @returns {{phip: number, lamp: number}}
+ */
+function createRotation(params, how) {
+  let phip, lamp;
+  if (how === paramSets.ROTATE) {
+    let lamc = params.oLongC;
+    let phic = params.oLatC;
+    let alpha = params.oAlpha;
+    if (Math.abs(Math.abs(phic) - HALF_PI) <= EPSLN) {
+      throw new Error('Invalid value for o_lat_c: ' + params.o_lat_c + ' should be < 90°');
+    }
+    lamp = lamc + Math.atan2(-1 * Math.cos(alpha), -1 * Math.sin(alpha) * Math.sin(phic));
+    phip = Math.asin(Math.cos(phic) * Math.sin(alpha));
+  } else if (how === paramSets.NEW_POLE) {
+    lamp = params.oLongP;
+    phip = params.oLatP;
+  } else {
+    let lam1 = params.oLong1;
+    let phi1 = params.oLat1;
+    let lam2 = params.oLong2;
+    let phi2 = params.oLat2;
+    let con = Math.abs(phi1);
+
+    if (Math.abs(phi1) > HALF_PI - EPSLN) {
+      throw new Error('Invalid value for o_lat_1: ' + params.o_lat_1 + ' should be < 90°');
+    }
+
+    if (Math.abs(phi2) > HALF_PI - EPSLN) {
+      throw new Error('Invalid value for o_lat_2: ' + params.o_lat_2 + ' should be < 90°');
+    }
+
+    if (Math.abs(phi1 - phi2) < EPSLN) {
+      throw new Error('Invalid value for o_lat_1 and o_lat_2: o_lat_1 should be different from o_lat_2');
+    }
+    if (con < EPSLN) {
+      throw new Error('Invalid value for o_lat_1: o_lat_1 should be different from zero');
+    }
+
+    lamp = Math.atan2(
+      (Math.cos(phi1) * Math.sin(phi2) * Math.cos(lam1))
+      - (Math.sin(phi1) * Math.cos(phi2) * Math.cos(lam2)),
+      (Math.sin(phi1) * Math.cos(phi2) * Math.sin(lam2))
+      - (Math.cos(phi1) * Math.sin(phi2) * Math.sin(lam1))
+    );
+
+    phip = Math.atan(-1 * Math.cos(lamp - lam1) / Math.tan(phi1));
+  }
+
+  return { lamp, phip };
+}
+
+/**
+ * Forward (lng, lat) to (x, y) for oblique case
+ * @param {import('../defs.js').ProjectionDefinition & LocalThis} self
+ * @param {{x: number, y: number}} lp - lambda, phi
+ */
+function forwardOblique(self, lp) {
+  let { x: lam, y: phi } = lp;
+  lam += self.long0;
+  const coslam = Math.cos(lam);
+  const sinphi = Math.sin(phi);
+  const cosphi = Math.cos(phi);
+
+  lp.x = adjust_lon(
+    Math.atan2(
+      cosphi * Math.sin(lam),
+      (self.sphip * cosphi * coslam) + (self.cphip * sinphi)
+    ) + self.lamp
+  );
+  lp.y = Math.asin(
+    (self.sphip * sinphi) - (self.cphip * cosphi * coslam)
+  );
+
+  return self.obliqueProjection.forward(lp);
+}
+
+/**
+ * Forward (lng, lat) to (x, y) for transverse case
+ * @param {import('../defs.js').ProjectionDefinition & LocalThis} self
+ * @param {{x: number, y: number}} lp - lambda, phi
+ */
+function forwardTransverse(self, lp) {
+  let { x: lam, y: phi } = lp;
+  lam += self.long0;
+  const cosphi = Math.cos(phi);
+  const coslam = Math.cos(lam);
+  lp.x = adjust_lon(
+    Math.atan2(
+      cosphi * Math.sin(lam),
+      Math.sin(phi)
+    ) + self.lamp
+  );
+  lp.y = Math.asin(-1 * cosphi * coslam);
+
+  return self.obliqueProjection.forward(lp);
+}
+
+/**
+ * Inverse (x, y) to (lng, lat) for oblique case
+ * @param {import('../defs.js').ProjectionDefinition & LocalThis} self
+ * @param {{x: number, y: number}} lp - lambda, phi
+ */
+function inverseOblique(self, lp) {
+  const innerLp = self.obliqueProjection.inverse(lp);
+  let { x: lam, y: phi } = innerLp;
+
+  if (lam < Number.MAX_VALUE) {
+    lam -= self.lamp;
+    const coslam = Math.cos(lam);
+    const sinphi = Math.sin(phi);
+    const cosphi = Math.cos(phi);
+    lp.x = Math.atan2(
+      cosphi * Math.sin(lam),
+      (self.sphip * cosphi * coslam) - (self.cphip * sinphi)
+    );
+    lp.y = Math.asin(
+      (self.sphip * sinphi) + (self.cphip * cosphi * coslam)
+    );
+  }
+
+  lp.x = adjust_lon(lp.x + self.long0);
+  return lp;
+}
+
+/**
+ * Inverse (x, y) to (lng, lat) for transverse case
+ * @param {import('../defs.js').ProjectionDefinition & LocalThis} self
+ * @param {{x: number, y: number}} lp - lambda, phi
+ */
+function inverseTransverse(self, lp) {
+  const innerLp = self.obliqueProjection.inverse(lp);
+  let { x: lam, y: phi } = innerLp;
+
+  if (lam < Number.MAX_VALUE) {
+    const cosphi = Math.cos(phi);
+    lam -= self.lamp;
+    lp.x = Math.atan2(
+      cosphi * Math.sin(lam),
+      -1 * Math.sin(phi)
+    );
+    lp.y = Math.asin(
+      cosphi * Math.cos(lam)
+    );
+  }
+
+  lp.x = adjust_lon(lp.x + self.long0);
+  return lp;
+}
+
+export var names = ['General Oblique Transformation', 'General_Oblique_Transformation', 'ob_tran'];
+export default {
+  init: init,
+  forward: forward,
+  inverse: inverse,
+  names: names
+};
diff --git a/projs.js b/projs.js
index c685cdc..50b0e9c 100644
--- a/projs.js
+++ b/projs.js
@@ -29,6 +29,7 @@ import tpers from './lib/projections/tpers';
 import geos from './lib/projections/geos';
 import eqearth from './lib/projections/eqearth';
 import bonne from './lib/projections/bonne';
+import ob_tran from './lib/projections/ob_tran';
 export default function (proj4) {
   proj4.Proj.projections.add(tmerc);
   proj4.Proj.projections.add(etmerc);
@@ -61,4 +62,5 @@ export default function (proj4) {
   proj4.Proj.projections.add(geos);
   proj4.Proj.projections.add(eqearth);
   proj4.Proj.projections.add(bonne);
+  proj4.Proj.projections.add(ob_tran);
 }
diff --git a/test/test.js b/test/test.js
index 8181d21..14236f0 100644
--- a/test/test.js
+++ b/test/test.js
@@ -773,6 +773,120 @@ function startTests(chai, proj4, fromArrayBuffer, testPoints) {
         assert.closeTo(resultWithOver[0], resultWithoutOver[0], 1e-6, 'x is close');
       });
     });
+
+    describe('ob_tran projection', function () {
+      it('should error no +o_proj supplied', function () {
+        assert.throws(function () {
+          proj4('+proj=ob_tran');
+        }, 'Missing parameter: o_proj', 'should work');
+      });
+
+      it('should error if +o_proj is also ob_tran', function () {
+        assert.throws(function () {
+          proj4('+proj=ob_tran +o_proj=ob_tran');
+        }, 'Invalid value for o_proj: ob_tran', 'should work');
+      });
+
+      it('should error if +o_proj is not a valid projection name', function () {
+        assert.throws(function () {
+          proj4('+proj=ob_tran +o_proj=something_that_will_never_exist');
+        }, 'Could not get projection name from: +proj=something_that_will_never_exist', 'should work');
+      });
+
+      it('should error if +o_lat_p is provided, but not +o_lon_p', function () {
+        assert.throws(function () {
+          proj4('+proj=ob_tran +o_proj=moll +o_lat_p=30');
+        }, 'Missing parameter: o_lon_p', 'should work');
+      });
+
+      it('should error if +o_lon_p is provided, but not +o_lat_p', function () {
+        assert.throws(function () {
+          proj4('+proj=ob_tran +o_proj=moll +o_lon_p=30');
+        }, 'Missing parameter: o_lat_p.', 'should work');
+      });
+
+      it('should error if parameters are NaN', function () {
+        [
+          ['+o_lat_p=30 +o_lon_p=foo', 'o_lon_p: foo'],
+          ['+o_lat_p=foo +o_lon_p=30', 'o_lat_p: foo'],
+          ['+o_lon_p=30 +o_lat_p=foo', 'o_lat_p: foo'],
+          ['+o_lon_p=foo +o_lat_p=30', 'o_lon_p: foo'],
+          ['+o_alpha=1.0.0 +o_lon_c=0 +o_lat_c=foo', 'o_lat_c: foo'],
+          ['+o_lon_1=-0- +o_lon_2=1.1e2 +o_lat_1=-10 +o_lat_2=FF2', 'o_lat_2: FF2']
+        ].forEach(function ([params, errorMsg]) {
+          assert.throws(function () {
+            proj4('+proj=ob_tran +o_proj=moll +' + params);
+          }, 'Invalid value for ' + errorMsg, 'should work');
+        });
+      });
+
+      it('shouldn\'t matter the order in which the user inputs parameters', function () {
+        const tests = [
+          [
+            'o_lon_p', 'x_0', 'o_lat_p'
+          ],
+          [
+            'lon_0', 'y_0', 'o_lon_1', 'o_lat_2', 'o_lat_1', 'o_lon_2'
+          ],
+          [
+            'o_lon_1', 'o_lon_c', 'o_alpha', 'o_lat_c'
+          ]
+        ];
+        tests.forEach(function (test) {
+          const str = '+proj=ob_tran +o_proj=moll '
+            + test.map(function (p, i) { return '+' + p + '=' + (30 + i); })
+              .join(' ');
+
+          assert.doesNotThrow(function () {
+            proj4(str);
+          }, undefined, undefined, 'should work');
+        });
+      });
+
+      it('should throw an error if o_lat_c is 90', function () {
+        const tests = [90, -90];
+        tests.forEach(function (test) {
+          const str = '+proj=ob_tran +o_proj=moll +o_lat_c=' + test + ' +o_lon_c=0 +o_alpha=1';
+          assert.throws(function () {
+            proj4(str);
+          }, 'Invalid value for o_lat_c: ' + test + ' should be < 90°', 'should work');
+        });
+      });
+
+      it('should throw an error if o_lat_1 is 90', function () {
+        const tests = [90, -90];
+        tests.forEach(function (test) {
+          const str = '+proj=ob_tran +o_proj=moll +o_lat_1=' + test + ' +o_lon_1=0 +o_lat_2=45 +o_lon_2=90';
+          assert.throws(function () {
+            proj4(str);
+          }, 'Invalid value for o_lat_1: ' + test + ' should be < 90°', 'should work');
+        });
+      });
+
+      it('should throw an error if o_lat_2 is 90', function () {
+        const tests = [90, -90];
+        tests.forEach(function (test) {
+          const str = '+proj=ob_tran +o_proj=moll +o_lat_2=' + test + ' +o_lon_1=0 +o_lat_1=45 +o_lon_2=90';
+          assert.throws(function () {
+            proj4(str);
+          }, 'Invalid value for o_lat_2: ' + test + ' should be < 90°', 'should work');
+        });
+      });
+
+      it('should throw an error if o_lat_1 = o_lat_2', function () {
+        const str = '+proj=ob_tran +o_proj=moll +o_lat_2=45 +o_lon_1=0 +o_lat_1=45 +o_lon_2=90';
+        assert.throws(function () {
+          proj4(str);
+        }, 'Invalid value for o_lat_1 and o_lat_2: o_lat_1 should be different from o_lat_2', 'should work');
+      });
+
+      it('should throw an error if o_lat_1 is 0', function () {
+        const str = '+proj=ob_tran +o_proj=moll +o_lat_2=45 +o_lon_1=0 +o_lat_1=0 +o_lon_2=90';
+        assert.throws(function () {
+          proj4(str);
+        }, 'Invalid value for o_lat_1: o_lat_1 should be different from zero', 'should work');
+      });
+    });
   });
 }
 if (typeof module !== 'undefined') {
diff --git a/test/testData.js b/test/testData.js
index 6379eb7..09b7722 100644
--- a/test/testData.js
+++ b/test/testData.js
@@ -699,6 +699,87 @@ var testPoints = [
     ll: [50.977303830208, 30.915260093747],
     xy: [5112279.911077, -4143196.76625]
   },
+  {
+    code: '+proj=moll +lon_0=10 +R=6400000',
+    ll: [-90, 85],
+    xy: [-2080158.10954, 8855229.1452],
+    acc: {
+      ll: 3,
+      xy: 3
+    }
+  },
+  {
+    code: '+proj=ob_tran +o_proj=moll +o_lat_p=45 +o_lon_p=-90',
+    ll: [-2, -1],
+    xy: [-7421459.0847, -5444548.62239],
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+    xy: [-1384841.18787, 7581707.88240],
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   {
     code: 'PROJCS["Mount Dillon / Tobago Grid",GEOGCS["Mount Dillon",DATUM["Mount_Dillon",SPHEROID["Clarke 1858",6378293.645208759,294.2606763692654,AUTHORITY["EPSG","7007"]],AUTHORITY["EPSG","6157"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.01745329251994328,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4157"]],UNIT["Clarke\'s link",0.201166195164,AUTHORITY["EPSG","9039"]],PROJECTION["Cassini_Soldner"],PARAMETER["latitude_of_origin",11.25217861111111],PARAMETER["central_meridian",-60.68600888888889],PARAMETER["false_easting",187500],PARAMETER["false_northing",180000],AUTHORITY["EPSG","2066"],AXIS["Easting",EAST],AXIS["Northing",NORTH]]',
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