diff --git a/.rubocop.yml b/.rubocop.yml
index 4795eec03..78847b5c4 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -101,34 +101,40 @@ RSpec:
       - expect_no_offenses
       - expect_offense
 
+RSpec/DescribeClass:
+  Exclude:
+    - spec/project/**/*.rb
+
 RSpec/ExampleLength:
   CountAsOne:
     - heredoc
   Max: 11
 
-RSpec/DescribeClass:
-  Exclude:
-    - spec/project/**/*.rb
+RSpec/ExpectInLet:
+  Enabled: true
 
 RSpec/MultipleExpectations:
   Max: 2
 
-# `expect_offense` does not use Kernel#format or String#%
-Style/FormatStringToken:
-  Exclude:
-    - spec/rubocop/**/*.rb
-
-Style/RequireOrder:
+RSpec/NoStringifiedInstanceDoubleConstant:
   Enabled: true
 
 RSpec/SpecFilePathFormat:
   Exclude:
     - spec/rubocop/cop/rspec/mixin/**/*.rb
 
+# `expect_offense` does not use Kernel#format or String#%
+Style/FormatStringToken:
+  Exclude:
+    - spec/rubocop/**/*.rb
+
 Style/NumberedParameters:
   Enabled: true
   EnforcedStyle: disallow
 
+Style/RequireOrder:
+  Enabled: true
+
 # Enable RuboCop's pending cops up to v1.63
 
 Gemspec/DeprecatedAttributeAssignment: {Enabled: true}
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3fb31d825..914180c55 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## Master (Unreleased)
 
+## 3.0.6 (2024-09-17)
+
+- Add `RSpec/NoStringifiedInstanceDoubleConstant` to check for and correct strings used as instance_doubles. ([@corsonknowles])
+
 ## 3.0.5 (2024-09-07)
 
 - Fix false-negative and error for `RSpec/MetadataStyle` when non-literal args are used in metadata in `EnforceStyle: hash`. ([@cbliard])
@@ -920,6 +924,7 @@ Compatibility release so users can upgrade RuboCop to 0.51.0. No new features.
 [@cfabianski]: https://github.com/cfabianski
 [@clupprich]: https://github.com/clupprich
 [@composerinteralia]: https://github.com/composerinteralia
+[@corsonknowles]: https://github.com/corsonknowles
 [@corydiamand]: https://github.com/corydiamand
 [@darhazer]: https://github.com/Darhazer
 [@daveworth]: https://github.com/daveworth
diff --git a/config/default.yml b/config/default.yml
index 62135b81d..74fd9568a 100644
--- a/config/default.yml
+++ b/config/default.yml
@@ -726,6 +726,13 @@ RSpec/NoExpectationExample:
     - "^expect_"
     - "^assert_"
 
+RSpec/NoStringifiedInstanceDoubleConstant:
+  Description: Do not use a string as `instance_double` constant.
+  Enabled: pending
+  Safe: true
+  VersionAdded: "<<next>>"
+  Reference: https://www.rubydoc.info/gems/rubocop-rspec/RuboCop/Cop/RSpec/NoStringifiedInstanceDoubleConstant
+
 RSpec/NotToNot:
   Description: Checks for consistent method usage for negating expectations.
   Enabled: true
diff --git a/lefthook.yml b/lefthook.yml
new file mode 100644
index 000000000..f6e5dfe59
--- /dev/null
+++ b/lefthook.yml
@@ -0,0 +1,35 @@
+# EXAMPLE USAGE:
+#
+#   Refer for explanation to following link:
+#   https://github.com/evilmartians/lefthook/blob/master/docs/configuration.md
+#
+# pre-push:
+#   commands:
+#     packages-audit:
+#       tags: frontend security
+#       run: yarn audit
+#     gems-audit:
+#       tags: backend security
+#       run: bundle audit
+#
+# pre-commit:
+#   parallel: true
+#   commands:
+#     eslint:
+#       glob: "*.{js,ts,jsx,tsx}"
+#       run: yarn eslint {staged_files}
+#     rubocop:
+#       tags: backend style
+#       glob: "*.rb"
+#       exclude: '(^|/)(application|routes)\.rb$'
+#       run: bundle exec rubocop --force-exclusion {all_files}
+#     govet:
+#       tags: backend style
+#       files: git ls-files -m
+#       glob: "*.go"
+#       run: go vet {files}
+#   scripts:
+#     "hello.js":
+#       runner: node
+#     "any.go":
+#       runner: go run
diff --git a/lib/rubocop/cop/rspec/no_stringified_instance_double_constant.rb b/lib/rubocop/cop/rspec/no_stringified_instance_double_constant.rb
new file mode 100644
index 000000000..2b074956a
--- /dev/null
+++ b/lib/rubocop/cop/rspec/no_stringified_instance_double_constant.rb
@@ -0,0 +1,42 @@
+# frozen_string_literal: true
+
+module RuboCop
+  module Cop
+    module RSpec
+      # Do not use a string as `instance_double` constant.
+      #
+      # @example
+      #   # bad
+      #   instance_double('Foo', ...)
+      #
+      #   # good
+      #   instance_double(Foo, ...)
+      #
+      class NoStringifiedInstanceDoubleConstant < Base
+        extend AutoCorrector
+
+        MSG = 'Do not use a string as `instance_double` constant.'
+        RESTRICT_ON_SEND = %i[instance_double].freeze
+
+        # @!method stringified_instance_double_const?(node)
+        def_node_matcher :stringified_instance_double_const?, <<~PATTERN
+          (send nil? :instance_double $...)
+        PATTERN
+
+        def on_send(node)
+          stringified_instance_double_const?(node) do |args_node|
+            if args_node.first.str_type?
+              add_offense(args_node.first) do |corrector|
+                autocorrect(corrector, args_node.first)
+              end
+            end
+          end
+        end
+
+        def autocorrect(corrector, node)
+          corrector.replace(node, node.value)
+        end
+      end
+    end
+  end
+end
diff --git a/lib/rubocop/cop/rspec_cops.rb b/lib/rubocop/cop/rspec_cops.rb
index 5eed7e860..0ddc55a3c 100644
--- a/lib/rubocop/cop/rspec_cops.rb
+++ b/lib/rubocop/cop/rspec_cops.rb
@@ -72,6 +72,7 @@
 require_relative 'rspec/named_subject'
 require_relative 'rspec/nested_groups'
 require_relative 'rspec/no_expectation_example'
+require_relative 'rspec/no_stringified_instance_double_constant'
 require_relative 'rspec/not_to_not'
 require_relative 'rspec/overwriting_setup'
 require_relative 'rspec/pending'
diff --git a/spec/rubocop/cop/rspec/no_stringified_instance_double_constant_spec.rb b/spec/rubocop/cop/rspec/no_stringified_instance_double_constant_spec.rb
new file mode 100644
index 000000000..107e5515d
--- /dev/null
+++ b/spec/rubocop/cop/rspec/no_stringified_instance_double_constant_spec.rb
@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+RSpec.describe RuboCop::Cop::RSpec::NoStringifiedInstanceDoubleConstant,
+               :config do
+  context 'when using a class for instance_double' do
+    let(:source) do
+      <<~RUBY
+        instance_double(Foo, failure_message, stubs)
+      RUBY
+    end
+
+    it { expect_no_offenses source }
+  end
+
+  context 'when using a symbol for instance_double' do
+    let(:source) do
+      <<~RUBY
+        instance_double(:Foo, failure_message, stubs)
+      RUBY
+    end
+
+    it { expect_no_offenses source }
+  end
+
+  context 'when using a string for instance_double' do
+    it 'replaces the string with the class' do
+      expect_offense <<~RUBY
+        instance_double('Foo', failure_message, stubs)
+                        ^^^^^ Do not use a string as `instance_double` constant.
+      RUBY
+
+      expect_correction <<~RUBY
+        instance_double(Foo, failure_message, stubs)
+      RUBY
+    end
+  end
+end