diff --git a/common/locales/en/api-v3.json b/common/locales/en/api-v3.json
index cd3133ffd9..e82133c009 100644
--- a/common/locales/en/api-v3.json
+++ b/common/locales/en/api-v3.json
@@ -53,5 +53,6 @@
   "userAlreadyInAParty": "User already in a party.",
   "userWithIDNotFound": "User with id \"<%= userId %>\" not found.",
   "uuidsMustBeAnArray": "UUIDs invites must be a an Array.",
-  "emailsMustBeAnArray": "Email invites must be a an Array."
+  "emailsMustBeAnArray": "Email invites must be a an Array.",
+  "canOnlyInviteMaxInvites": "You can only invite \"<%= maxInvites %>\" at a time"
 }
diff --git a/test/api/v3/integration/groups/POST-groups_invite.test.js b/test/api/v3/integration/groups/POST-groups_invite.test.js
index 1bb604bd19..2466bdf649 100644
--- a/test/api/v3/integration/groups/POST-groups_invite.test.js
+++ b/test/api/v3/integration/groups/POST-groups_invite.test.js
@@ -2,6 +2,9 @@ import {
   generateUser,
   translate as t,
 } from '../../../../helpers/api-integration.helper';
+import { v4 as generateUUID } from 'uuid';
+
+const INVITES_LIMIT = 100;
 
 describe('Post /groups/:groupId/invite', () => {
   let inviter;
@@ -18,7 +21,7 @@ describe('Post /groups/:groupId/invite', () => {
 
   describe('user id invites', () => {
     it('returns an error when invited user is not found', async () => {
-      let fakeID = '206039c6-24e4-4b9f-8a31-61cbb9aa3f66';
+      let fakeID = generateUUID();
 
       await expect(inviter.post(`/groups/${group._id}/invite`, {
         uuids: [fakeID],
@@ -31,7 +34,7 @@ describe('Post /groups/:groupId/invite', () => {
     });
 
     it('returns an error when uuids is not an array', async () => {
-      let fakeID = '206039c6-24e4-4b9f-8a31-61cbb9aa3f66';
+      let fakeID = generateUUID();
 
       await expect(inviter.post(`/groups/${group._id}/invite`, {
         uuids: {fakeID},
@@ -50,6 +53,23 @@ describe('Post /groups/:groupId/invite', () => {
       .to.eventually.be.empty;
     });
 
+    it('returns an error when there are more than INVITES_LIMIT uuids', async () => {
+      let uuids = [];
+
+      for (let i = 0; i < 101; i += 1) {
+        uuids.push(generateUUID());
+      }
+
+      await expect(inviter.post(`/groups/${group._id}/invite`, {
+        uuids,
+      }))
+      .to.eventually.be.rejected.and.eql({
+        code: 400,
+        error: 'BadRequest',
+        message: t('canOnlyInviteMaxInvites', {maxInvites: INVITES_LIMIT}),
+      });
+    });
+
     it('invites a user to a group by uuid', async () => {
       let userToInvite = await generateUser();
 
@@ -85,10 +105,24 @@ describe('Post /groups/:groupId/invite', () => {
       await expect(userToInvite.get('/user')).to.eventually.have.deep.property('invitations.guilds[0].id', group._id);
       await expect(userToInvite2.get('/user')).to.eventually.have.deep.property('invitations.guilds[0].id', group._id);
     });
+
+    it('returns an error when inviting multiple users and a user is not found', async () => {
+      let userToInvite = await generateUser();
+      let fakeID = generateUUID();
+
+      await expect(inviter.post(`/groups/${group._id}/invite`, {
+        uuids: [userToInvite._id, fakeID],
+      }))
+      .to.eventually.be.rejected.and.eql({
+        code: 404,
+        error: 'NotFound',
+        message: t('userWithIDNotFound', {userId: fakeID}),
+      });
+    });
   });
 
   describe('email invites', () => {
-    let testInvite = {name: 'test', email: 'test@habitca.com'};
+    let testInvite = {name: 'test', email: 'test@habitica.com'};
 
     it('returns an error when invite is missing an email', async () => {
       await expect(inviter.post(`/groups/${group._id}/invite`, {
@@ -119,6 +153,23 @@ describe('Post /groups/:groupId/invite', () => {
       .to.eventually.be.empty;
     });
 
+    it('returns an error when there are more than INVITES_LIMIT emails', async () => {
+      let emails = [];
+
+      for (let i = 0; i < 101; i += 1) {
+        emails.push(`${generateUUID()}@habitica.com`);
+      }
+
+      await expect(inviter.post(`/groups/${group._id}/invite`, {
+        emails,
+      }))
+      .to.eventually.be.rejected.and.eql({
+        code: 400,
+        error: 'BadRequest',
+        message: t('canOnlyInviteMaxInvites', {maxInvites: INVITES_LIMIT}),
+      });
+    });
+
     it('invites a user to a group by email', async () => {
       await expect(inviter.post(`/groups/${group._id}/invite`, {
         emails: [testInvite],
@@ -127,7 +178,7 @@ describe('Post /groups/:groupId/invite', () => {
 
     it('invites multiple users to a group by email', async () => {
       await expect(inviter.post(`/groups/${group._id}/invite`, {
-        emails: [testInvite, {name: 'test2', email: 'test2@habitca.com'}],
+        emails: [testInvite, {name: 'test2', email: 'test2@habitica.com'}],
       })).to.exist;
     });
   });
@@ -142,11 +193,34 @@ describe('Post /groups/:groupId/invite', () => {
       });
     });
 
+    it('returns an error when there are more than INVITES_LIMIT uuids and emails', async () => {
+      let emails = [];
+      let uuids = [];
+
+      for (let i = 0; i < 50; i += 1) {
+        emails.push(`${generateUUID()}@habitica.com`);
+      }
+
+      for (let i = 0; i < 51; i += 1) {
+        uuids.push(generateUUID());
+      }
+
+      await expect(inviter.post(`/groups/${group._id}/invite`, {
+        emails,
+        uuids,
+      }))
+      .to.eventually.be.rejected.and.eql({
+        code: 400,
+        error: 'BadRequest',
+        message: t('canOnlyInviteMaxInvites', {maxInvites: INVITES_LIMIT}),
+      });
+    });
+
     it('invites users to a group by uuid and email', async () => {
       let newUser = await generateUser();
       let invite = await inviter.post(`/groups/${group._id}/invite`, {
         uuids: [newUser._id],
-        emails: [{name: 'test', email: 'test@habitca.com'}],
+        emails: [{name: 'test', email: 'test@habitica.com'}],
       });
       let invitedUser = await newUser.get('/user');
 
diff --git a/website/src/controllers/api-v3/groups.js b/website/src/controllers/api-v3/groups.js
index 0114240481..d1ca3f6e13 100644
--- a/website/src/controllers/api-v3/groups.js
+++ b/website/src/controllers/api-v3/groups.js
@@ -2,7 +2,10 @@ import { authWithHeaders } from '../../middlewares/api-v3/auth';
 import Q from 'q';
 import _ from 'lodash';
 import cron from '../../middlewares/api-v3/cron';
-import { model as Group } from '../../models/group';
+import {
+  INVITES_LIMIT,
+  model as Group,
+} from '../../models/group';
 import { model as User } from '../../models/user';
 import { model as EmailUnsubscription } from '../../models/emailUnsubscription';
 import {
@@ -407,7 +410,7 @@ async function _inviteByUUID (uuid, group, inviter, req, res) {
     if (_.find(userToInvite.invitations.guilds, {id: group._id})) {
       throw new NotAuthorized(res.t('userAlreadyInvitedToGroup'));
     }
-    userToInvite.invitations.guilds.push({id: group._id, name: group.name, inviter: res.locals.user._id});
+    userToInvite.invitations.guilds.push({id: group._id, name: group.name, inviter: inviter._id});
   } else if (group.type === 'party') {
     if (!_.isEmpty(userToInvite.invitations.party)) {
       throw new NotAuthorized(res.t('userAlreadyPendingInvitation'));
@@ -417,7 +420,7 @@ async function _inviteByUUID (uuid, group, inviter, req, res) {
     }
     // @TODO: Why was this here?
     // req.body.type in 'guild', 'party'
-    userToInvite.invitations.party = {id: group._id, name: group.name, inviter: res.locals.user._id};
+    userToInvite.invitations.party = {id: group._id, name: group.name, inviter: inviter._id};
   }
 
   let groupLabel = group.type === 'guild' ? 'Guild' : 'Party';
@@ -532,13 +535,26 @@ api.inviteToGroup = {
     }
 
     let results = [];
+    let totalInvites = 0;
 
-    if (uuids && !uuidsIsArray) {
-      throw new BadRequest(res.t('uuidsMustBeAnArray'));
+    if (uuids) {
+      if (!uuidsIsArray) {
+        throw new BadRequest(res.t('uuidsMustBeAnArray'));
+      } else {
+        totalInvites += uuids.length;
+      }
     }
 
-    if (emails && !emailsIsArray) {
-      throw new BadRequest(res.t('emailsMustBeAnArray'));
+    if (emails) {
+      if (!emailsIsArray) {
+        throw new BadRequest(res.t('emailsMustBeAnArray'));
+      } else {
+        totalInvites += emails.length;
+      }
+    }
+
+    if (totalInvites > INVITES_LIMIT) {
+      throw new BadRequest(res.t('canOnlyInviteMaxInvites', {maxInvites: INVITES_LIMIT}));
     }
 
     if (uuids) {
diff --git a/website/src/models/group.js b/website/src/models/group.js
index a45d2eaa60..27ca80e73f 100644
--- a/website/src/models/group.js
+++ b/website/src/models/group.js
@@ -520,3 +520,5 @@ model.count({_id: 'habitrpg'}, (err, ct) => {
     privacy: 'public',
   }).save();
 });
+
+export const INVITES_LIMIT = 100;