diff --git a/app/controllers/accounts_controller.rb b/app/controllers/accounts_controller.rb
index 0195e9ae60b..e4739bad92a 100644
--- a/app/controllers/accounts_controller.rb
+++ b/app/controllers/accounts_controller.rb
@@ -82,6 +82,11 @@ require 'csv'
 #           "example": "12",
 #           "type": "integer"
 #         },
+#         "lti_guid": {
+#           "description": "The account's identifier that is sent as context_id in LTI launches.",
+#           "example": "123xyz",
+#           "type": "string"
+#         },
 #         "workflow_state": {
 #           "description": "The state of the account. Can be 'active' or 'deleted'.",
 #           "example": "active",
@@ -104,6 +109,12 @@ class AccountsController < ApplicationController
   # students and even teachers will get an empty list in response, only
   # account admins can view the accounts that they are in.
   #
+  # @argument include[] [String, "lti_guid"|"registration_settings"]
+  #   Array of additional information to include.
+  #
+  #   "lti_guid":: the 'tool_consumer_instance_guid' that will be sent for this account on LTI launches
+  #   "registration_settings":: returns info about the privacy policy and terms of use
+  #
   # @returns [Account]
   def index
     respond_to do |format|
@@ -117,7 +128,10 @@ class AccountsController < ApplicationController
           @accounts = []
         end
         ActiveRecord::Associations::Preloader.new(@accounts, :root_account).run
-        render :json => @accounts.map { |a| account_json(a, @current_user, session, params[:includes] || [], false) }
+
+        # originally had 'includes' instead of 'include' like other endpoints
+        includes = params[:include] || params[:includes]
+        render :json => @accounts.map { |a| account_json(a, @current_user, session, includes || [], false) }
       end
     end
   end
diff --git a/lib/api/v1/account.rb b/lib/api/v1/account.rb
index 29a18af7b59..02c37f171fb 100644
--- a/lib/api/v1/account.rb
+++ b/lib/api/v1/account.rb
@@ -48,6 +48,7 @@ module Api::V1::Account
       hash['sis_account_id'] = account.sis_source_id if !account.root_account? && account.root_account.grants_any_right?(user, :read_sis, :manage_sis)
       hash['sis_import_id'] = account.sis_batch_id if !account.root_account? && account.root_account.grants_right?(user, session, :manage_sis)
       hash['integration_id'] = account.integration_id if !account.root_account? && account.root_account.grants_any_right?(user, :read_sis, :manage_sis)
+      hash['lti_guid'] = account.lti_guid if includes.include?('lti_guid')
       if includes.include?('registration_settings')
         hash['registration_settings'] = {:login_handle_name => account.login_handle_name}
         if account.root_account?
diff --git a/spec/apis/v1/accounts_api_spec.rb b/spec/apis/v1/accounts_api_spec.rb
index 4891349c0ca..b488130de02 100644
--- a/spec/apis/v1/accounts_api_spec.rb
+++ b/spec/apis/v1/accounts_api_spec.rb
@@ -203,6 +203,22 @@ describe "Accounts API", type: :request do
           }
       )
     end
+
+    it "should return the lti_guid" do
+      @a1.lti_guid = 'hey'
+      @a1.save!
+      json = api_call(:get, "/api/v1/accounts?include[]=lti_guid",
+                      { :controller => 'accounts', :action => 'index', :format => 'json', :include => ['lti_guid'] }, {})
+      expect(json[0]["lti_guid"]).to eq 'hey'
+    end
+
+    it "should honor deprecated includes parameter" do
+      @a1.lti_guid = 'hey'
+      @a1.save!
+      json = api_call(:get, "/api/v1/accounts?includes[]=lti_guid",
+                      { :controller => 'accounts', :action => 'index', :format => 'json', :includes => ['lti_guid'] }, {})
+      expect(json[0]["lti_guid"]).to eq 'hey'
+    end
   end
 
   describe 'update' do