diff --git a/app/controllers/concerns/web_app_controller_concern.rb b/app/controllers/concerns/web_app_controller_concern.rb
index ec2256aa9c..aa16270a4a 100644
--- a/app/controllers/concerns/web_app_controller_concern.rb
+++ b/app/controllers/concerns/web_app_controller_concern.rb
@@ -8,6 +8,7 @@ module WebAppControllerConcern
 
     before_action :redirect_unauthenticated_to_permalinks!
     before_action :set_referer_header
+    before_action :redirect_to_tos_interstitial!
 
     content_security_policy do |p|
       policy = ContentSecurityPolicy.new
@@ -45,6 +46,12 @@ module WebAppControllerConcern
 
   protected
 
+  def redirect_to_tos_interstitial!
+    return unless current_user&.require_tos_interstitial
+
+    redirect_to(terms_of_service_interstitial_url)
+  end
+
   def set_referer_header
     response.set_header('Referrer-Policy', Setting.allow_referrer_origin ? 'strict-origin-when-cross-origin' : 'same-origin')
   end
diff --git a/app/controllers/terms_of_service_controller.rb b/app/controllers/terms_of_service_controller.rb
index 672fb07915..35b9d45fe8 100644
--- a/app/controllers/terms_of_service_controller.rb
+++ b/app/controllers/terms_of_service_controller.rb
@@ -4,8 +4,19 @@ class TermsOfServiceController < ApplicationController
   include WebAppControllerConcern
 
   skip_before_action :require_functional!
+  skip_before_action :redirect_to_tos_interstitial!
+
+  before_action :clear_redirect_interstitial!
 
   def show
     expires_in(15.seconds, public: true, stale_while_revalidate: 30.seconds, stale_if_error: 1.day) unless user_signed_in?
   end
+
+  private
+
+  def clear_redirect_interstitial!
+    return unless user_signed_in?
+
+    current_user.update(require_tos_interstitial: false)
+  end
 end
diff --git a/app/controllers/terms_of_service_interstitial_controller.rb b/app/controllers/terms_of_service_interstitial_controller.rb
new file mode 100644
index 0000000000..081e58e2d7
--- /dev/null
+++ b/app/controllers/terms_of_service_interstitial_controller.rb
@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+class TermsOfServiceInterstitialController < ApplicationController
+  vary_by 'Accept-Language'
+
+  def show
+    @terms_of_service = TermsOfService.published.first
+
+    render 'terms_of_service_interstitial/show', layout: 'auth'
+  end
+end
diff --git a/app/models/terms_of_service.rb b/app/models/terms_of_service.rb
index 3b69a40a1a..f29094036d 100644
--- a/app/models/terms_of_service.rb
+++ b/app/models/terms_of_service.rb
@@ -23,6 +23,8 @@ class TermsOfService < ApplicationRecord
 
   validate :effective_date_cannot_be_in_the_past
 
+  NOTIFICATION_ACTIVITY_CUTOFF = 1.year.freeze
+
   def published?
     published_at.present?
   end
@@ -39,8 +41,20 @@ class TermsOfService < ApplicationRecord
     notification_sent_at.present?
   end
 
+  def base_user_scope
+    User.confirmed.where(created_at: ..published_at).joins(:account)
+  end
+
+  def email_notification_cutoff
+    published_at - NOTIFICATION_ACTIVITY_CUTOFF
+  end
+
+  def scope_for_interstitial
+    base_user_scope.merge(Account.suspended).or(base_user_scope.where(current_sign_in_at: [nil, ...email_notification_cutoff]))
+  end
+
   def scope_for_notification
-    User.confirmed.joins(:account).merge(Account.without_suspended).where(created_at: (..published_at))
+    base_user_scope.merge(Account.without_suspended).where(current_sign_in_at: email_notification_cutoff...)
   end
 
   private
diff --git a/app/models/user.rb b/app/models/user.rb
index 72f7490043..cc2d348052 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -25,6 +25,7 @@
 #  otp_backup_codes          :string           is an Array
 #  otp_required_for_login    :boolean          default(FALSE), not null
 #  otp_secret                :string
+#  require_tos_interstitial  :boolean          default(FALSE), not null
 #  reset_password_sent_at    :datetime
 #  reset_password_token      :string
 #  settings                  :text
diff --git a/app/views/terms_of_service_interstitial/show.html.haml b/app/views/terms_of_service_interstitial/show.html.haml
new file mode 100644
index 0000000000..cbb181a32d
--- /dev/null
+++ b/app/views/terms_of_service_interstitial/show.html.haml
@@ -0,0 +1,14 @@
+- content_for :header_tags do
+  %meta{ name: 'robots', content: 'noindex, noarchive' }/
+
+- content_for :body_classes, 'app-body'
+
+.simple_form
+  %h1.title= t('terms_of_service_interstitial.title', domain: site_hostname)
+
+  %p.lead= t('terms_of_service_interstitial.preamble_html', date: l(@terms_of_service.effective_date || Time.zone.today))
+
+  %p.lead= t('user_mailer.terms_of_service_changed.agreement', domain: site_hostname)
+
+  .stacked-actions
+    = link_to t('terms_of_service_interstitial.review_link'), terms_of_service_path, class: 'button'
diff --git a/app/workers/admin/distribute_terms_of_service_notification_worker.rb b/app/workers/admin/distribute_terms_of_service_notification_worker.rb
index 7370ee87e8..3e1f651060 100644
--- a/app/workers/admin/distribute_terms_of_service_notification_worker.rb
+++ b/app/workers/admin/distribute_terms_of_service_notification_worker.rb
@@ -6,6 +6,8 @@ class Admin::DistributeTermsOfServiceNotificationWorker
   def perform(terms_of_service_id)
     terms_of_service = TermsOfService.find(terms_of_service_id)
 
+    terms_of_service.scope_for_interstitial.in_batches.update_all(require_tos_interstitial: true)
+
     terms_of_service.scope_for_notification.find_each do |user|
       UserMailer.terms_of_service_changed(user, terms_of_service).deliver_later!
     end
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 63ef106d5c..a5ba589002 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -1912,6 +1912,10 @@ en:
     does_not_match_previous_name: does not match the previous name
   terms_of_service:
     title: Terms of Service
+  terms_of_service_interstitial:
+    preamble_html: We're making some changes to our terms of service, effective <strong>%{date}</strong>. We encourage you to review the updated terms.
+    review_link: Review terms of service
+    title: The terms of service of %{domain} are changing
   themes:
     contrast: Mastodon (High contrast)
     default: Mastodon (Dark)
diff --git a/config/routes.rb b/config/routes.rb
index 2fff44851e..f60dc22621 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -208,6 +208,7 @@ Rails.application.routes.draw do
   get '/privacy-policy',   to: 'privacy#show', as: :privacy_policy
   get '/terms-of-service', to: 'terms_of_service#show', as: :terms_of_service
   get '/terms-of-service/:date', to: 'terms_of_service#show', as: :terms_of_service_version
+  get '/terms-of-service-update', to: 'terms_of_service_interstitial#show', as: :terms_of_service_interstitial
   get '/terms', to: redirect('/terms-of-service')
 
   match '/', via: [:post, :put, :patch, :delete], to: 'application#raise_not_found', format: false
diff --git a/db/migrate/20250428104538_add_require_tos_interstitial_to_users.rb b/db/migrate/20250428104538_add_require_tos_interstitial_to_users.rb
new file mode 100644
index 0000000000..646ebe5d09
--- /dev/null
+++ b/db/migrate/20250428104538_add_require_tos_interstitial_to_users.rb
@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class AddRequireTosInterstitialToUsers < ActiveRecord::Migration[8.0]
+  def change
+    add_column :users, :require_tos_interstitial, :boolean, null: false, default: false
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index db1687ba99..cd7eca8c4b 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.0].define(version: 2025_04_28_095029) do
+ActiveRecord::Schema[8.0].define(version: 2025_04_28_104538) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "pg_catalog.plpgsql"
 
@@ -1222,6 +1222,7 @@ ActiveRecord::Schema[8.0].define(version: 2025_04_28_095029) do
     t.string "time_zone"
     t.string "otp_secret"
     t.datetime "age_verified_at"
+    t.boolean "require_tos_interstitial", default: false, null: false
     t.index ["account_id"], name: "index_users_on_account_id"
     t.index ["confirmation_token"], name: "index_users_on_confirmation_token", unique: true
     t.index ["created_by_application_id"], name: "index_users_on_created_by_application_id", where: "(created_by_application_id IS NOT NULL)"
diff --git a/spec/workers/admin/distribute_terms_of_service_notification_worker_spec.rb b/spec/workers/admin/distribute_terms_of_service_notification_worker_spec.rb
index 27ddfb28bc..a09e581151 100644
--- a/spec/workers/admin/distribute_terms_of_service_notification_worker_spec.rb
+++ b/spec/workers/admin/distribute_terms_of_service_notification_worker_spec.rb
@@ -14,9 +14,10 @@ RSpec.describe Admin::DistributeTermsOfServiceNotificationWorker do
 
     context 'with valid terms' do
       let(:terms) { Fabricate(:terms_of_service) }
-      let!(:user) { Fabricate :user, confirmed_at: 3.days.ago }
+      let!(:user) { Fabricate(:user, confirmed_at: 3.days.ago) }
+      let!(:old_user) { Fabricate(:user, confirmed_at: 2.years.ago, current_sign_in_at: 2.years.ago) }
 
-      it 'sends the terms update via email', :inline_jobs do
+      it 'sends the terms update via email and change the old user to require an interstitial', :inline_jobs do
         emails = capture_emails { worker.perform(terms.id) }
 
         expect(emails.size)
@@ -26,6 +27,9 @@ RSpec.describe Admin::DistributeTermsOfServiceNotificationWorker do
             to: [user.email],
             subject: I18n.t('user_mailer.terms_of_service_changed.subject')
           )
+
+        expect(user.reload.require_tos_interstitial).to be false
+        expect(old_user.reload.require_tos_interstitial).to be true
       end
     end
   end