diff --git a/changelog/new_add_new_rails_to_formatted_s_cop.md b/changelog/new_add_new_rails_to_formatted_s_cop.md
new file mode 100644
index 0000000000..1998d56ad2
--- /dev/null
+++ b/changelog/new_add_new_rails_to_formatted_s_cop.md
@@ -0,0 +1 @@
+* [#691](https://github.com/rubocop/rubocop-rails/pull/691): Add new `Rails/ToFormattedS` cop. ([@koic][])
diff --git a/config/default.yml b/config/default.yml
index ee8fa92ae4..e73f9af002 100644
--- a/config/default.yml
+++ b/config/default.yml
@@ -905,6 +905,16 @@ Rails/TimeZoneAssignment:
     - spec/**/*.rb
     - test/**/*.rb
 
+Rails/ToFormattedS:
+  Description: 'Checks for consistent uses of `to_fs` or `to_formatted_s`.'
+  StyleGuide: 'https://rails.rubystyle.guide/#prefer-to-fs'
+  Enabled: pending
+  EnforcedStyle: to_fs
+  SupportedStyles:
+    - to_fs
+    - to_formatted_s
+  VersionAdded: '<<next>>'
+
 Rails/TransactionExitStatement:
   Description: 'Avoid the usage of `return`, `break` and `throw` in transaction blocks.'
   Enabled: pending
diff --git a/lib/rubocop/cop/rails/to_formatted_s.rb b/lib/rubocop/cop/rails/to_formatted_s.rb
new file mode 100644
index 0000000000..96e2580327
--- /dev/null
+++ b/lib/rubocop/cop/rails/to_formatted_s.rb
@@ -0,0 +1,45 @@
+# frozen_string_literal: true
+
+module RuboCop
+  module Cop
+    module Rails
+      # This cop checks for consistent uses of `to_fs` or `to_formatted_s`,
+      # depending on the cop's configuration.
+      #
+      # @example EnforcedStyle: to_fs (default)
+      #
+      #   # bad
+      #   time.to_formatted_s(:db)
+      #
+      #   # good
+      #   time.to_fs(:db)
+      #
+      # @example EnforcedStyle: to_formatted_s
+      #
+      #   # bad
+      #   time.to_fs(:db)
+      #
+      #   # good
+      #   time.to_formatted_s(:db)
+      #
+      class ToFormattedS < Base
+        include ConfigurableEnforcedStyle
+        extend AutoCorrector
+        extend TargetRailsVersion
+
+        minimum_target_rails_version 7.0
+
+        MSG = 'Use `%<prefer>s` instead.'
+        RESTRICT_ON_SEND = %i[to_formatted_s to_fs].freeze
+
+        def on_send(node)
+          return if node.method?(style)
+
+          add_offense(node.loc.selector, message: format(MSG, prefer: style)) do |corrector|
+            corrector.replace(node.loc.selector, style)
+          end
+        end
+      end
+    end
+  end
+end
diff --git a/lib/rubocop/cop/rails_cops.rb b/lib/rubocop/cop/rails_cops.rb
index 0615c7a2f9..2d3a80d544 100644
--- a/lib/rubocop/cop/rails_cops.rb
+++ b/lib/rubocop/cop/rails_cops.rb
@@ -107,6 +107,7 @@
 require_relative 'rails/table_name_assignment'
 require_relative 'rails/time_zone'
 require_relative 'rails/time_zone_assignment'
+require_relative 'rails/to_formatted_s'
 require_relative 'rails/transaction_exit_statement'
 require_relative 'rails/uniq_before_pluck'
 require_relative 'rails/unique_validation_without_index'
diff --git a/spec/rubocop/cop/rails/to_formatted_s_spec.rb b/spec/rubocop/cop/rails/to_formatted_s_spec.rb
new file mode 100644
index 0000000000..b01d986884
--- /dev/null
+++ b/spec/rubocop/cop/rails/to_formatted_s_spec.rb
@@ -0,0 +1,69 @@
+# frozen_string_literal: true
+
+RSpec.describe RuboCop::Cop::Rails::ToFormattedS, :config do
+  context 'Rails >= 7.0', :rails70 do
+    context 'EnforcedStyle: to_fs' do
+      let(:cop_config) { { 'EnforcedStyle' => 'to_fs' } }
+
+      it 'registers and corrects an offense when using `to_formatted_s`' do
+        expect_offense(<<~RUBY)
+          time.to_formatted_s(:db)
+               ^^^^^^^^^^^^^^ Use `to_fs` instead.
+        RUBY
+
+        expect_correction(<<~RUBY)
+          time.to_fs(:db)
+        RUBY
+      end
+
+      it 'does not register an offense when using `to_fs`' do
+        expect_no_offenses(<<~RUBY)
+          time.to_fs(:db)
+        RUBY
+      end
+    end
+
+    context 'EnforcedStyle: to_formatted_s' do
+      let(:cop_config) { { 'EnforcedStyle' => 'to_formatted_s' } }
+
+      it 'registers and corrects an offense when using `to_fs`' do
+        expect_offense(<<~RUBY)
+          time.to_fs(:db)
+               ^^^^^ Use `to_formatted_s` instead.
+        RUBY
+
+        expect_correction(<<~RUBY)
+          time.to_formatted_s(:db)
+        RUBY
+      end
+
+      it 'does not register an offense when using `to_formatted_s`' do
+        expect_no_offenses(<<~RUBY)
+          time.to_formatted_s(:db)
+        RUBY
+      end
+    end
+  end
+
+  context 'Rails <= 6.1', :rails61 do
+    context 'EnforcedStyle: to_fs' do
+      let(:cop_config) { { 'EnforcedStyle' => 'to_fs' } }
+
+      it 'does not register an offense when using `to_formatted_s`' do
+        expect_no_offenses(<<~RUBY)
+          time.to_formatted_s(:db)
+        RUBY
+      end
+    end
+
+    context 'EnforcedStyle: to_formatted_s' do
+      let(:cop_config) { { 'EnforcedStyle' => 'to_formatted_s' } }
+
+      it 'does not register an offense when using `to_fs`' do
+        expect_no_offenses(<<~RUBY)
+          time.to_fs(:db)
+        RUBY
+      end
+    end
+  end
+end
diff --git a/spec/support/shared_contexts.rb b/spec/support/shared_contexts.rb
index aac0827c53..f6eddb00ee 100644
--- a/spec/support/shared_contexts.rb
+++ b/spec/support/shared_contexts.rb
@@ -23,3 +23,7 @@
 RSpec.shared_context 'with Rails 6.1', :rails61 do
   let(:rails_version) { 6.1 }
 end
+
+RSpec.shared_context 'with Rails 7.0', :rails70 do
+  let(:rails_version) { 7.0 }
+end