diff --git a/test/api/party.coffee b/test/api/party.coffee
index 152ac98ab9..1ba86ac0d6 100644
--- a/test/api/party.coffee
+++ b/test/api/party.coffee
@@ -129,7 +129,7 @@ describe "Party", ->
     group = undefined
     participating = []
     notParticipating = []
-    before (done) ->
+    beforeEach (done) ->
       # Tavern boss, side-by-side
       Group.update(
         _id: "habitrpg"
@@ -310,6 +310,20 @@ describe "Party", ->
         expect(_.size(res.body.quest.members)).to.equal 3
         done()
 
+    it "allows quest participants to leave quest", (done) ->
+      leavingMember = party[1]
+      expect(group.quest.members[leavingMember._id]).to.eql(true)
+
+      request.post(baseURL + "/groups/" + group._id + "/questLeave")
+        .set("X-API-User", leavingMember._id)
+        .set("X-API-Key", leavingMember.apiToken)
+        .end (err, res) ->
+          expectCode res, 201
+          request.get(baseURL + '/groups/party')
+            .end (err, res) ->
+              expect(res.body.quest.members[leavingMember._id]).to.not.be.ok
+              done()
+
     xit "Hurts the boss", (done) ->
       request.post(baseURL + "/user/batch-update").end (res) ->
         user = res.body
diff --git a/test/server_side/controllers/groups.test.js b/test/server_side/controllers/groups.test.js
new file mode 100644
index 0000000000..4d735e7c71
--- /dev/null
+++ b/test/server_side/controllers/groups.test.js
@@ -0,0 +1,133 @@
+var sinon = require('sinon');
+var chai = require("chai")
+chai.use(require("sinon-chai"))
+var expect = chai.expect
+
+var groupsController = require('../../../website/src/controllers/groups');
+
+describe('Groups Controller', function() {
+
+  describe('#questLeave', function() {
+    var res, req, group, user, saveSpy;
+
+    beforeEach(function() {
+      sinon.stub(process, 'nextTick').yields();
+
+      group = {
+        _id: 'group-id',
+        type: 'party',
+        quest: {
+          leader : 'another-user',
+          active: true,
+          members: {
+            'user-id': true,
+            'another-user': true
+          },
+          key : 'vice1',
+          progress : {
+              hp : 364,
+              collect : {}
+          }
+        },
+        save: sinon.stub().yields(),
+        markModified: sinon.spy()
+      };
+
+      user = {
+        _id: 'user-id',
+        party : {
+          quest : {
+              key : 'vice1',
+              progress : {
+                  up : 50,
+                  down : 0,
+                  collect : {}
+              },
+              completed : null,
+              RSVPNeeded : false
+          }
+        }
+      };
+
+      res = {
+        locals: {
+          group: group,
+          user: user
+        },
+        json: sinon.stub(),
+        send: sinon.stub()
+      };
+
+      req = { };
+    });
+
+    afterEach(function () {
+      process.nextTick.restore();
+    });
+
+    context('error conditions', function() {
+      it('errors if quest is not active', function() {
+        group.quest.active = false;
+
+        groupsController.questLeave(req, res);
+
+        expect(res.json).to.be.calledOnce;
+        expect(res.json).to.be.calledWith(
+          404,
+          { err: 'No active quest to leave' }
+        );
+      });
+
+      it('errors if user is not part of quest', function() {
+        delete group.quest.members[user._id];
+
+        groupsController.questLeave(req, res);
+
+        expect(res.json).to.be.calledOnce;
+        expect(res.json).to.be.calledWith(
+          403,
+          { err: 'You are not part of the quest' }
+        );
+      });
+
+      it('does not allow quest leader to leave quest', function() {
+        group.quest.leader = 'user-id';
+
+        groupsController.questLeave(req, res);
+
+        expect(res.json).to.be.calledOnce;
+        expect(res.json).to.be.calledWith(
+          403,
+          { err: 'Quest leader cannot leave quest' }
+        );
+      });
+
+      it('sends 500 if group cannot save', function() {
+        group.save = sinon.stub().yields('save error');
+        var nextSpy = sinon.spy();
+
+        groupsController.questLeave(req, res, nextSpy);
+
+        expect(nextSpy).to.be.calledOnce;
+        expect(nextSpy).to.be.calledWith('save error');
+      });
+    });
+
+    context('success', function() {
+      it('removes user from quest', function() {
+        expect(group.quest.members[user._id]).to.exist;
+
+        groupsController.questLeave(req, res);
+
+        expect(group.quest.members[user._id]).to.not.exist;
+      });
+
+      it('sends back 201 on success', function() {
+        groupsController.questLeave(req, res);
+
+        expect(res.send).to.be.calledOnce;
+        expect(res.send).to.be.calledWith(201);
+      });
+    });
+  });
+});
diff --git a/website/src/controllers/groups.js b/website/src/controllers/groups.js
index 8443a905b8..4a2a1e588f 100644
--- a/website/src/controllers/groups.js
+++ b/website/src/controllers/groups.js
@@ -1072,3 +1072,29 @@ api.questAbort = function(req, res, next){
     group = null;
   })
 }
+
+api.questLeave = function(req, res, next) {
+  // Non-member leave quest while still in progress
+  var group = res.locals.group;
+  var user = res.locals.user;
+
+  if (!(group.quest && group.quest.active)) {
+    return res.json(404, { err: 'No active quest to leave' });
+  }
+
+  if (!(group.quest.members && group.quest.members[user._id])) {
+    return res.json(403, { err: 'You are not part of the quest' });
+  }
+
+  if (group.quest.leader === user._id) {
+    return res.json(403, { err: 'Quest leader cannot leave quest' });
+  }
+
+  delete group.quest.members[user._id];
+  group.markModified('quest.members');
+
+  group.save(function(err, result) {
+    if (err) return next(err);
+    res.send(201);
+  });
+}
diff --git a/website/src/routes/apiv2.coffee b/website/src/routes/apiv2.coffee
index 082db2efa6..22babced8f 100644
--- a/website/src/routes/apiv2.coffee
+++ b/website/src/routes/apiv2.coffee
@@ -527,6 +527,14 @@ module.exports = (swagger, v2) ->
       middleware: [auth.auth, i18n.getUserLanguage, groups.attachGroup]
       action: groups.questAbort
 
+    "/groups/{gid}/questLeave":
+      spec:
+        method: 'POST'
+        description: 'Leave an active quest (Quest leaders cannot leave active quests. They must abort the quest to leave)'
+        parameters: [path('gid','Group to leave quest in','string')]
+      middleware: [auth.auth, i18n.getUserLanguage, groups.attachGroup]
+      action: groups.questLeave
+
     #TODO PUT  /groups/:gid/chat/:messageId
 
     "/groups/{gid}/chat:GET":