diff --git a/.rubocop.yml b/.rubocop.yml
index ac9797608..1edaa3623 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -14,12 +14,12 @@ AllCops:
 Layout/AccessModifierIndentation:
   EnforcedStyle: indent
 
-Layout/AlignHash:
+Layout/HashAlignment:
   EnforcedHashRocketStyle: key
   EnforcedColonStyle: key
   EnforcedLastArgumentHashStyle: ignore_implicit
 
-Layout/AlignParameters:
+Layout/ParameterAlignment:
   EnforcedStyle: with_first_parameter
 
 Style/AndOr:
@@ -83,7 +83,7 @@ Naming/FileName:
   Enabled: false
   Exclude: []
 
-Layout/IndentFirstParameter:
+Layout/FirstParameterIndentation:
   EnforcedStyle: consistent
 
 Style/For:
@@ -111,10 +111,10 @@ Layout/IndentationConsistency:
 Layout/IndentationWidth:
   Width: 2
 
-Layout/IndentFirstArrayElement:
+Layout/FirstArrayElementIndentation:
   EnforcedStyle: special_inside_parentheses
 
-Layout/IndentFirstHashElement:
+Layout/FirstHashElementIndentation:
   EnforcedStyle: special_inside_parentheses
 
 Style/Next:
@@ -197,9 +197,9 @@ Naming/PredicateName:
   - is_
   - has_
   - have_
-  NamePrefixBlacklist:
+  ForbiddenPrefixes:
   - is_
-  NameWhitelist:
+  AllowedMethods:
     - is_a?
   Exclude:
   - spec/**/*
@@ -282,7 +282,7 @@ Style/TernaryParentheses:
   EnforcedStyle: require_no_parentheses
   AllowSafeAssignment: true
 
-Layout/TrailingBlankLines:
+Layout/TrailingEmptyLines:
   EnforcedStyle: final_newline
 
 Style/TrailingCommaInArguments:
@@ -411,7 +411,7 @@ Lint/UnusedMethodArgument:
 Lint/EachWithObjectArgument:
   Enabled: true
 
-Lint/HandleExceptions:
+Lint/SuppressedException:
   Enabled: false
 
 Lint/LiteralAsCondition:
diff --git a/Gemfile b/Gemfile
index 1bd21c3f7..ccb50763a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -23,6 +23,7 @@ gem 'yomu'
 # Gems for OAuth2 subsystem
 gem 'doorkeeper', '>= 4.6'
 gem 'omniauth'
+gem 'omniauth-azure-activedirectory'
 gem 'omniauth-linkedin-oauth2'
 
 # TODO: remove this when omniauth gem resolves CVE issues
diff --git a/Gemfile.lock b/Gemfile.lock
index c6bed7429..edef64cc1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -364,6 +364,9 @@ GEM
     omniauth (1.9.0)
       hashie (>= 3.4.6, < 3.7.0)
       rack (>= 1.6.2, < 3)
+    omniauth-azure-activedirectory (1.0.0)
+      jwt (~> 1.5)
+      omniauth (~> 1.1)
     omniauth-linkedin-oauth2 (1.0.0)
       omniauth-oauth2
     omniauth-oauth2 (1.6.0)
@@ -648,6 +651,7 @@ DEPENDENCIES
   newrelic_rpm
   nokogiri (~> 1.10.3)
   omniauth
+  omniauth-azure-activedirectory
   omniauth-linkedin-oauth2
   omniauth-rails_csrf_protection (~> 0.1)
   overcommit
diff --git a/app/assets/stylesheets/themes/scinote.scss b/app/assets/stylesheets/themes/scinote.scss
index aa1faf9c4..7be1f04a1 100644
--- a/app/assets/stylesheets/themes/scinote.scss
+++ b/app/assets/stylesheets/themes/scinote.scss
@@ -380,6 +380,16 @@ a[data-toggle="tooltip"] {
   width: 100%;
 }
 
+.azure-sign-in-actions {
+  margin-bottom: 10px;
+  margin-top: 10px;
+
+  .btn-azure-ad {
+    background-color: $office-ms-word;
+    color: $color-white;
+  }
+}
+
 .navbar-secondary {
   -webkit-transition: all 0.5s ease;
   -moz-transition: all 0.5s ease;
diff --git a/app/controllers/users/omniauth_callbacks_controller.rb b/app/controllers/users/omniauth_callbacks_controller.rb
index 79c75d232..13fcbd415 100644
--- a/app/controllers/users/omniauth_callbacks_controller.rb
+++ b/app/controllers/users/omniauth_callbacks_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Users
   class OmniauthCallbacksController < Devise::OmniauthCallbacksController
     include UsersGenerator
@@ -13,6 +15,53 @@ module Users
     # def twitter
     # end
 
+    def customazureactivedirectory
+      auth = request.env['omniauth.auth']
+      provider_id = auth.dig(:extra, :raw_info, :id_token_claims, :aud)
+      provider_conf = Rails.configuration.x.azure_ad_apps[provider_id]
+      raise StandardError, 'No matching Azure AD provider config found' if provider_conf.empty?
+
+      auth.provider = provider_conf[:provider]
+
+      return redirect_to connected_accounts_path if current_user
+
+      email = auth.info.email
+      email ||= auth.dig(:extra, :raw_info, :id_token_claims, :emails)&.first
+      user = User.from_omniauth(auth)
+      if user
+        # User found in database so just sign in him
+        sign_in_and_redirect(user)
+      elsif email.present?
+        user = User.find_by(email: email)
+
+        if user.blank?
+          # Create new user and identity
+          User.create_from_omniauth!(auth)
+          sign_in_and_redirect(user)
+        elsif provider_conf[:auto_link_on_sign_in]
+          # Link to existing local account
+          user.user_identities.create!(provider: auth.provider, uid: auth.uid)
+          sign_in_and_redirect(user)
+        else
+          # Cannot do anything with it, so just return an error
+          error_message = I18n.t('devise.azure.errors.no_local_user_map')
+          redirect_to after_omniauth_failure_path_for(resource_name)
+        end
+      end
+    rescue StandardError => e
+      Rails.logger.error e.message
+      Rails.logger.error e.backtrace.join("\n")
+      error_message = I18n.t('devise.azure.errors.failed_to_save') if e.is_a?(ActiveRecord::RecordInvalid)
+      error_message ||= I18n.t('devise.azure.errors.generic')
+      redirect_to after_omniauth_failure_path_for(resource_name)
+    ensure
+      if error_message
+        set_flash_message(:alert, :failure, kind: I18n.t('devise.azure.provider_name'), reason: error_message)
+      else
+        set_flash_message(:notice, :success, kind: I18n.t('devise.azure.provider_name'))
+      end
+    end
+
     def linkedin
       auth_hash = request.env['omniauth.auth']
 
diff --git a/app/helpers/addons_helper.rb b/app/helpers/addons_helper.rb
index 150af4976..9a5622ff0 100644
--- a/app/helpers/addons_helper.rb
+++ b/app/helpers/addons_helper.rb
@@ -3,6 +3,6 @@ module AddonsHelper
     Rails::Engine
       .subclasses
       .select { |c| c.name.start_with?('Scinote') }
-      .map(&:parent)
+      .map(&:module_parent)
   end
 end
diff --git a/app/models/user.rb b/app/models/user.rb
index ce0cd785d..c00accce1 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -297,6 +297,20 @@ class User < ApplicationRecord
       .take
   end
 
+  def self.create_from_omniauth!(auth)
+    full_name = "#{auth.info.first_name} #{auth.info.last_name}"
+    user = User.new(full_name: full_name,
+                    initials: generate_initials(full_name),
+                    email: email,
+                    password: generate_user_password)
+    User.transaction do
+      user.save!
+      user.user_identities.create!(provider: auth.provider, uid: auth.uid)
+      user.update!(confirmed_at: user.created_at)
+    end
+    user
+  end
+
   # Search all active users for username & email. Can
   # also specify which team to ignore.
   def self.search(
diff --git a/app/services/api/azure_jwt.rb b/app/services/api/azure_jwt.rb
index f6804d2ce..e2076f043 100644
--- a/app/services/api/azure_jwt.rb
+++ b/app/services/api/azure_jwt.rb
@@ -42,7 +42,7 @@ module Api
       end
 
       # Decode token payload and verify it's signature.
-      payload, = JWT.decode(
+      payload, header = JWT.decode(
         token,
         OpenSSL::PKey::RSA.new(fetch_rsa_key(k_id, app_id)),
         true,
@@ -54,7 +54,7 @@ module Api
         iss: app_config[:iss],
         nbf_leeway: LEEWAY
       )
-      HashWithIndifferentAccess.new(payload)
+      [HashWithIndifferentAccess.new(payload), HashWithIndifferentAccess.new(header)]
     end
   end
 end
diff --git a/app/views/users/shared/_azure_sign_in_links.html.erb b/app/views/users/shared/_azure_sign_in_links.html.erb
new file mode 100644
index 000000000..fb5c5fab8
--- /dev/null
+++ b/app/views/users/shared/_azure_sign_in_links.html.erb
@@ -0,0 +1,7 @@
+<% Rails.configuration.x.azure_ad_apps.select { |uid, config| config[:enable_sign_in] }.each do |uid, config| %>
+  <div class="form-group">
+    <%= form_tag user_customazureactivedirectory_omniauth_authorize_path(provider: config[:provider]), method: :post do %>
+      <%= submit_tag config[:sign_in_label], class: 'btn btn-azure-ad' %>
+    <% end %>
+  </div>
+<% end %>
diff --git a/app/views/users/shared/_links.html.erb b/app/views/users/shared/_links.html.erb
index 91f2fec81..5770842f7 100644
--- a/app/views/users/shared/_links.html.erb
+++ b/app/views/users/shared/_links.html.erb
@@ -37,4 +37,8 @@
       <% end -%>
     <% end -%>
   <% end -%>
+
+  <div class="azure-sign-in-actions">
+    <%= render partial: "users/shared/azure_sign_in_links", locals: { resource_name: resource_name } %>
+  </div>
 </div>
diff --git a/config/initializers/azure_ad.rb b/config/initializers/azure_ad.rb
index 78cfc9b23..12807fc10 100644
--- a/config/initializers/azure_ad.rb
+++ b/config/initializers/azure_ad.rb
@@ -2,6 +2,8 @@
 
 Rails.application.configure do
   vars = ENV.select { |name, _| name =~ /^[[:alnum:]]*_AZURE_AD_APP_ID/ }
+  config.x.azure_ad_apps = HashWithIndifferentAccess.new if vars.present?
+
   vars.each do |name, value|
     app_name = name.sub('_AZURE_AD_APP_ID', '')
     config.x.azure_ad_apps[value] = {}
@@ -20,5 +22,16 @@ Rails.application.configure do
     raise StandardError, "No PROVIDER_NAME for #{app_name} Azure app" unless provider
 
     config.x.azure_ad_apps[value][:provider] = provider
+
+    config.x.azure_ad_apps[value][:enable_sign_in] = ENV["#{app_name}_AZURE_AD_ENABLE_SIGN_IN"] == 'true'
+
+    next unless config.x.azure_ad_apps[value][:enable_sign_in]
+
+    config.x.azure_ad_apps[value][:sign_in_label] = ENV["#{app_name}_AZURE_AD_SIGN_IN_LABEL"] || 'Sign in with Azure AD'
+    config.x.azure_ad_apps[value][:auto_link_on_sign_in] = ENV["#{app_name}_AZURE_AD_AUTO_LINK_ON_SIGN_IN"] == 'true'
+
+    if ENV["#{app_name}_AZURE_AD_SIGN_IN_POLICY"]
+      config.x.azure_ad_apps[value][:sign_in_policy] = ENV["#{app_name}_AZURE_AD_SIGN_IN_POLICY"]
+    end
   end
 end
diff --git a/config/initializers/extends.rb b/config/initializers/extends.rb
index 98010eeaa..ee9b9f3de 100644
--- a/config/initializers/extends.rb
+++ b/config/initializers/extends.rb
@@ -73,7 +73,7 @@ class Extends
                                         'RepositoryListValue' => 'list',
                                         'RepositoryAssetValue' => 'file' }
 
-  OMNIAUTH_PROVIDERS = [:linkedin]
+  OMNIAUTH_PROVIDERS = [:linkedin, :customazureactivedirectory]
 
   INITIAL_USER_OPTIONS = {}
 
diff --git a/config/initializers/omniauth.rb b/config/initializers/omniauth.rb
new file mode 100644
index 000000000..34f6512da
--- /dev/null
+++ b/config/initializers/omniauth.rb
@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+require 'omniauth/strategies/custom_azure_active_directory'
+
+SETUP_PROC = lambda do |env|
+  providers = Rails.configuration.x.azure_ad_apps.select { |_, v| v[:enable_sign_in] == true }
+  raise StandardError, 'No Azure AD config available for sign in' if providers.empty?
+
+  req = Rack::Request.new(env)
+
+  if providers.size > 1
+    if req.params['id_token'].present? # Callback phase
+      unverified_jwt_payload, = JWT.decode(req.params['id_token'], nil, false)
+      raise StandardError, 'No Azure AD config available for sign in' if providers[unverified_jwt_payload['aud']].blank?
+
+      provider_id = unverified_jwt_payload['aud']
+    else # Authorization phase
+      raise ActionController::ParameterMissing, 'Provider name is missing' if req.params['provider'].empty?
+
+      provider_id = providers.select { |_, v| v[:provider] == req.params['provider'] }.keys.first
+      raise StandardError, 'No Azure AD config available for sign in' if provider_id.blank?
+    end
+  end
+
+  provider_id ||= providers.keys.first
+  provider_conf = providers[provider_id]
+
+  env['omniauth.strategy'].options[:client_id] = provider_id
+  env['omniauth.strategy'].options[:openid_config_url] = provider_conf[:conf_url]
+  env['omniauth.strategy'].options[:sign_in_policy] = provider_conf[:sign_in_policy]
+end
+
+Rails.application.config.middleware.use OmniAuth::Builder do
+  provider OmniAuth::Strategies::CustomAzureActiveDirectory, setup: SETUP_PROC
+end
+
+OmniAuth.config.logger = Rails.logger
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 3bbed6ecf..1b17d6343 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -51,6 +51,12 @@ en:
       complete_sign_up: "You have to complete the sign up process"
       email_already_taken: "SciNote account with email %{email} alreday exists"
       failed_to_save: "Failed to create new user"
+    azure:
+      provider_name: "Azure Active Directory"
+      errors:
+        generic: "Failed to sign in user"
+        no_local_user_map: "No local user record found"
+        failed_to_save: "Failed to create new user"
 
   doorkeeper:
     authorizations:
diff --git a/lib/omniauth/strategies/custom_azure_active_directory.rb b/lib/omniauth/strategies/custom_azure_active_directory.rb
new file mode 100644
index 000000000..eec52f6f3
--- /dev/null
+++ b/lib/omniauth/strategies/custom_azure_active_directory.rb
@@ -0,0 +1,46 @@
+# frozen_string_literal: true
+
+module OmniAuth
+  module Strategies
+    class CustomAzureActiveDirectory < AzureActiveDirectory
+      include OmniAuth::Strategy
+
+      option :openid_config_url
+      option :sign_in_policy
+
+      # Azure doesn't allow query params in callback URL
+      def callback_url
+        full_host + script_name + callback_path
+      end
+
+      def openid_config_url
+        options[:openid_config_url]
+      end
+
+      def authorize_endpoint_url
+        uri = URI(openid_config['authorization_endpoint'])
+        params = {
+          client_id: client_id,
+          redirect_uri: callback_url,
+          response_mode: response_mode,
+          response_type: response_type,
+          nonce: new_nonce,
+          scope: 'openid'
+        }
+        params[:p] = options[:sign_in_policy] if options[:sign_in_policy].present?
+
+        uri.query = URI.encode_www_form(params)
+        uri.to_s
+      end
+
+      def validate_and_parse_id_token(id_token)
+        jwt_claims, jwt_header = Api::AzureJwt.decode(id_token)
+        return jwt_claims, jwt_header if jwt_claims['nonce'] == read_nonce
+
+        raise JWT::DecodeError, 'Returned nonce did not match.'
+      end
+    end
+  end
+end
+
+OmniAuth.config.add_camelization 'custom_azure_activedirectory', 'CustomAzureActiveDirectory'