diff --git a/.env b/.env
index 3182c16226..7ecc2646d5 100644
--- a/.env
+++ b/.env
@@ -42,14 +42,6 @@ SMTP_PASSWORD="f00d"
 # Javascript error reporting via Bugsnag.
 # BUGSNAG_JS_KEY=""
 
-# SingleSignOn login for Discourse
-#
-# DISCOURSE_SSO_SECRET should be a random string. It must be the same as provided to your Discourse instance.
-# DISCOURSE_SSO_SECRET=""
-#
-# DISCOURSE_URL must be the URL of your Discourse instance.
-# DISCOURSE_URL="https://noticeboard.openfoodnetwork.org.au"
-
 # see="https://developers.google.com/maps/documentation/javascript/get-api-key
 # GOOGLE_MAPS_API_KEY="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
 # see https://developers.google.com/maps/documentation/javascript/localization#Region
diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index a2c635f20a..bd71576ee1 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -6,11 +6,6 @@
 # Note that changes in the inspected code, or installation of new
 # versions of RuboCop, may require this file to be generated again.
 
-# Offense count: 2
-Lint/DuplicateMethods:
-  Exclude:
-    - 'lib/discourse/single_sign_on.rb'
-
 # Offense count: 16
 # Configuration parameters: AllowComments, AllowEmptyLambdas.
 Lint/EmptyBlock:
@@ -104,7 +99,6 @@ Metrics/AbcSize:
     - 'app/models/spree/order/checkout.rb'
     - 'app/models/spree/preferences/preferable_class_methods.rb'
     - 'app/models/spree/return_authorization.rb'
-    - 'lib/discourse/single_sign_on.rb'
     - 'lib/open_food_network/order_cycle_form_applicator.rb'
     - 'lib/open_food_network/order_cycle_permissions.rb'
     - 'lib/spree/core/controller_helpers/order.rb'
@@ -205,7 +199,6 @@ Metrics/CyclomaticComplexity:
     - 'app/models/spree/tax_rate.rb'
     - 'app/models/spree/variant.rb'
     - 'app/models/spree/zone.rb'
-    - 'lib/discourse/single_sign_on.rb'
     - 'lib/open_food_network/enterprise_issue_validator.rb'
     - 'lib/reporting/reports/xero_invoices/base.rb'
     - 'lib/spree/core/controller_helpers/order.rb'
@@ -227,7 +220,6 @@ Metrics/MethodLength:
     - 'app/models/spree/order/checkout.rb'
     - 'app/models/spree/payment/processing.rb'
     - 'app/models/spree/preferences/preferable_class_methods.rb'
-    - 'lib/discourse/single_sign_on.rb'
     - 'lib/open_food_network/order_cycle_form_applicator.rb'
     - 'lib/open_food_network/order_cycle_permissions.rb'
     - 'lib/reporting/reports/enterprise_fee_summary/scope.rb'
@@ -1011,7 +1003,6 @@ Style/SlicingWithRange:
     - 'app/helpers/spree/admin/navigation_helper.rb'
     - 'app/services/embedded_page_service.rb'
     - 'engines/order_management/app/services/order_management/subscriptions/validator.rb'
-    - 'lib/discourse/single_sign_on.rb'
 
 # Offense count: 25
 # This cop supports unsafe autocorrection (--autocorrect-all).
@@ -1019,7 +1010,6 @@ Style/SlicingWithRange:
 Style/StringConcatenation:
   Exclude:
     - 'app/controllers/admin/stripe_connect_settings_controller.rb'
-    - 'app/helpers/discourse_helper.rb'
     - 'app/helpers/enterprises_helper.rb'
     - 'app/helpers/spree/admin/base_helper.rb'
     - 'app/mailers/spree/user_mailer.rb'
diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index f0bc1c0255..8c5675b217 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -28,7 +28,6 @@ class ApplicationController < ActionController::Base
   helper 'injection'
   helper 'markdown'
   helper 'footer_links'
-  helper 'discourse'
   helper 'checkout'
   helper 'link'
   helper 'terms_and_conditions'
diff --git a/app/controllers/discourse_sso_controller.rb b/app/controllers/discourse_sso_controller.rb
deleted file mode 100644
index 8ac609e931..0000000000
--- a/app/controllers/discourse_sso_controller.rb
+++ /dev/null
@@ -1,52 +0,0 @@
-# frozen_string_literal: true
-
-require 'discourse/single_sign_on'
-
-class DiscourseSsoController < ApplicationController
-  include SharedHelper
-  include DiscourseHelper
-
-  before_action :require_config
-
-  def login
-    if require_activation?
-      redirect_to discourse_url
-    else
-      redirect_to discourse_login_url
-    end
-  end
-
-  def sso
-    if spree_current_user
-      begin
-        redirect_to sso_url
-      rescue TypeError
-        render plain: "Bad SingleSignOn request.", status: :bad_request
-      end
-    else
-      redirect_to login_path
-    end
-  end
-
-  private
-
-  def sso_url
-    secret = discourse_sso_secret!
-    sso = Discourse::SingleSignOn.parse(request.query_string, secret)
-    sso.email = spree_current_user.email
-    sso.username = spree_current_user.login
-    sso.external_id = spree_current_user.id
-    sso.sso_secret = secret
-    sso.admin = admin_user?
-    sso.require_activation = require_activation?
-    sso.to_url(discourse_sso_url)
-  end
-
-  def require_config
-    raise ActionController::RoutingError, 'Not Found' unless discourse_configured?
-  end
-
-  def require_activation?
-    !admin_user? && !spree_current_user.confirmed?
-  end
-end
diff --git a/app/helpers/discourse_helper.rb b/app/helpers/discourse_helper.rb
deleted file mode 100644
index 28b45209a2..0000000000
--- a/app/helpers/discourse_helper.rb
+++ /dev/null
@@ -1,27 +0,0 @@
-# frozen_string_literal: true
-
-module DiscourseHelper
-  def discourse_configured?
-    discourse_url.present?
-  end
-
-  def discourse_url
-    ENV.fetch('DISCOURSE_URL', nil)
-  end
-
-  def discourse_login_url
-    discourse_url + '/login'
-  end
-
-  def discourse_sso_url
-    discourse_url + '/session/sso_login'
-  end
-
-  def discourse_url!
-    discourse_url || raise('Missing Discourse URL')
-  end
-
-  def discourse_sso_secret!
-    ENV['DISCOURSE_SSO_SECRET'] || raise('Missing SSO secret')
-  end
-end
diff --git a/app/views/shared/menu/_signed_in.html.haml b/app/views/shared/menu/_signed_in.html.haml
index 34b7bcfc06..059580c1a2 100644
--- a/app/views/shared/menu/_signed_in.html.haml
+++ b/app/views/shared/menu/_signed_in.html.haml
@@ -1,9 +1,3 @@
-- if discourse_configured?
-  %li
-    %a{href: main_app.discourse_login_path, target: '_blank'}
-      %span.nav-primary
-        = t 'label_notices'
-
 %li.user-menu.has-dropdown.not-click
 
   %a{href: "#", class: "top-bar--menu-item-with-icon"}
diff --git a/app/views/shared/menu/_signed_in_offcanvas.html.haml b/app/views/shared/menu/_signed_in_offcanvas.html.haml
index c6f0e6be8a..e5ec28bef4 100644
--- a/app/views/shared/menu/_signed_in_offcanvas.html.haml
+++ b/app/views/shared/menu/_signed_in_offcanvas.html.haml
@@ -1,10 +1,3 @@
-- if discourse_configured?
-  %li.li-menu
-    %a{href: main_app.discourse_login_path, target: '_blank'}
-      %span.nav-primary
-        %i.ofn-i_025-notepad
-        = t 'label_notices'
-
 - if admin_user? or enterprise_user?
   %li
     %a{href: spree.admin_dashboard_path, target:'_blank'}
diff --git a/config/locales/en.yml b/config/locales/en.yml
index a705c300b8..78e9c8f25c 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -2188,7 +2188,6 @@ en:
   label_account: "Account"
   label_more: "Show more"
   label_less: "Show less"
-  label_notices: "Notices"
 
   cart_items: "items"
   cart_headline: "Your shopping cart"
diff --git a/config/routes.rb b/config/routes.rb
index ba182c9607..7537dd4615 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -11,9 +11,6 @@ Openfoodnetwork::Application.routes.draw do
   get "/login", to: redirect("/#/login")
   get '/unauthorized', :to => 'home#unauthorized', :as => :unauthorized
 
-  get "/discourse/login", to: "discourse_sso#login"
-  get "/discourse/sso", to: "discourse_sso#sso"
-
   get "/map", to: "map#index", as: :map
   get "/sell", to: "home#sell", as: :sell
 
diff --git a/lib/discourse/single_sign_on.rb b/lib/discourse/single_sign_on.rb
deleted file mode 100644
index 5e2db79461..0000000000
--- a/lib/discourse/single_sign_on.rb
+++ /dev/null
@@ -1,107 +0,0 @@
-# frozen_string_literal: true
-
-# This class is the reference implementation of a SSO provider from Discourse.
-
-module Discourse
-  class SingleSignOn
-    ACCESSORS = [:nonce, :name, :username, :email, :avatar_url, :avatar_force_update,
-                 :require_activation, :about_me, :external_id, :return_sso_url, :admin, :moderator,
-                 :suppress_welcome_message].freeze
-    FIXNUMS = [].freeze
-    BOOLS = [:avatar_force_update, :admin, :moderator, :require_activation,
-             :suppress_welcome_message].freeze
-    NONCE_EXPIRY_TIME = 10.minutes
-
-    attr_accessor(*ACCESSORS, :sso_secret, :sso_url)
-
-    def self.sso_secret
-      raise "sso_secret not implemented on class, be sure to set it on instance"
-    end
-
-    def self.sso_url
-      raise "sso_url not implemented on class, be sure to set it on instance"
-    end
-
-    def self.parse(payload, sso_secret = nil)
-      sso = new
-      sso.sso_secret = sso_secret if sso_secret
-
-      parsed = Rack::Utils.parse_query(payload)
-      if sso.sign(parsed["sso"]) != parsed["sig"]
-        diags = "\n\nsso: #{parsed['sso']}\n\nsig: #{parsed['sig']}\n\n" \
-                "expected sig: #{sso.sign(parsed['sso'])}"
-        raise "Bad signature for payload #{diags}" unless parsed["sso"] =~ %r{[^a-zA-Z0-9=\r\n/+]}m
-
-        raise "The SSO field should be Base64 encoded, using only A-Z, a-z, 0-9, +, /, " \
-              "and = characters. Your input contains characters we don't understand as Base64, " \
-              "see http://en.wikipedia.org/wiki/Base64 #{diags}"
-
-      end
-
-      decoded = Base64.decode64(parsed["sso"])
-      decoded_hash = Rack::Utils.parse_query(decoded)
-
-      ACCESSORS.each do |k|
-        val = decoded_hash[k.to_s]
-        val = val.to_i if FIXNUMS.include? k
-        if BOOLS.include? k
-          val = ["true", "false"].include?(val) ? val == "true" : nil
-        end
-        sso.public_send("#{k}=", val)
-      end
-
-      decoded_hash.each do |k, v|
-        # 1234567
-        # custom.
-        #
-        if k[0..6] == "custom."
-          field = k[7..-1]
-          sso.custom_fields[field] = v
-        end
-      end
-
-      sso
-    end
-
-    def sso_secret
-      @sso_secret || self.class.sso_secret
-    end
-
-    def sso_url
-      @sso_url || self.class.sso_url
-    end
-
-    def custom_fields
-      @custom_fields ||= {}
-    end
-
-    def sign(payload)
-      OpenSSL::HMAC.hexdigest("sha256", sso_secret, payload)
-    end
-
-    def to_url(base_url = nil)
-      base = (base_url || sso_url).to_s
-      "#{base}#{base.include?('?') ? '&' : '?'}#{payload}"
-    end
-
-    def payload
-      payload = Base64.encode64(unsigned_payload)
-      "sso=#{CGI.escape(payload)}&sig=#{sign(payload)}"
-    end
-
-    def unsigned_payload
-      payload = {}
-      ACCESSORS.each do |k|
-        next if (val = public_send k).nil?
-
-        payload[k] = val
-      end
-
-      @custom_fields&.each do |k, v|
-        payload["custom.#{k}"] = v.to_s
-      end
-
-      Rack::Utils.build_query(payload)
-    end
-  end
-end