diff --git a/src/catch2/benchmark/detail/catch_estimate_clock.hpp b/src/catch2/benchmark/detail/catch_estimate_clock.hpp
index 6da24ce5..576fdb68 100644
--- a/src/catch2/benchmark/detail/catch_estimate_clock.hpp
+++ b/src/catch2/benchmark/detail/catch_estimate_clock.hpp
@@ -15,7 +15,6 @@
 #include <catch2/benchmark/detail/catch_stats.hpp>
 #include <catch2/benchmark/detail/catch_measure.hpp>
 #include <catch2/benchmark/detail/catch_run_for_at_least.hpp>
-#include <catch2/benchmark/catch_clock.hpp>
 #include <catch2/internal/catch_unique_ptr.hpp>
 
 #include <algorithm>
diff --git a/src/catch2/benchmark/detail/catch_timing.hpp b/src/catch2/benchmark/detail/catch_timing.hpp
index da567190..7dfe822b 100644
--- a/src/catch2/benchmark/detail/catch_timing.hpp
+++ b/src/catch2/benchmark/detail/catch_timing.hpp
@@ -13,8 +13,6 @@
 #include <catch2/benchmark/catch_clock.hpp>
 #include <catch2/benchmark/detail/catch_complete_invoke.hpp>
 
-#include <type_traits>
-
 namespace Catch {
     namespace Benchmark {
         template <typename Result>
diff --git a/src/catch2/catch_session.cpp b/src/catch2/catch_session.cpp
index a4a410c9..0fb45ba7 100644
--- a/src/catch2/catch_session.cpp
+++ b/src/catch2/catch_session.cpp
@@ -25,7 +25,6 @@
 #include <catch2/internal/catch_stdstreams.hpp>
 #include <catch2/internal/catch_istream.hpp>
 
-#include <algorithm>
 #include <cassert>
 #include <exception>
 #include <iomanip>
diff --git a/src/catch2/catch_tostring.cpp b/src/catch2/catch_tostring.cpp
index 83327cfb..f96c3fc1 100644
--- a/src/catch2/catch_tostring.cpp
+++ b/src/catch2/catch_tostring.cpp
@@ -11,7 +11,6 @@
 #include <catch2/internal/catch_context.hpp>
 #include <catch2/internal/catch_polyfills.hpp>
 
-#include <cmath>
 #include <iomanip>
 
 namespace Catch {
diff --git a/src/catch2/interfaces/catch_interfaces_config.hpp b/src/catch2/interfaces/catch_interfaces_config.hpp
index eb054805..82a298db 100644
--- a/src/catch2/interfaces/catch_interfaces_config.hpp
+++ b/src/catch2/interfaces/catch_interfaces_config.hpp
@@ -12,7 +12,6 @@
 #include <catch2/internal/catch_stringref.hpp>
 
 #include <chrono>
-#include <iosfwd>
 #include <string>
 #include <vector>
 
diff --git a/src/catch2/interfaces/catch_interfaces_reporter.hpp b/src/catch2/interfaces/catch_interfaces_reporter.hpp
index a052c5db..e8f5d519 100644
--- a/src/catch2/interfaces/catch_interfaces_reporter.hpp
+++ b/src/catch2/interfaces/catch_interfaces_reporter.hpp
@@ -20,7 +20,6 @@
 #include <map>
 #include <string>
 #include <vector>
-#include <iosfwd>
 
 namespace Catch {
 
diff --git a/src/catch2/internal/catch_enforce.hpp b/src/catch2/internal/catch_enforce.hpp
index 076cea3c..ddb6d845 100644
--- a/src/catch2/internal/catch_enforce.hpp
+++ b/src/catch2/internal/catch_enforce.hpp
@@ -12,8 +12,6 @@
 #include <catch2/internal/catch_compiler_capabilities.hpp>
 #include <catch2/internal/catch_reusable_string_stream.hpp>
 
-#include <exception>
-
 namespace Catch {
 #if !defined(CATCH_CONFIG_DISABLE_EXCEPTIONS)
     template <typename Ex>
diff --git a/src/catch2/internal/catch_exception_translator_registry.hpp b/src/catch2/internal/catch_exception_translator_registry.hpp
index 3123e93d..32917d41 100644
--- a/src/catch2/internal/catch_exception_translator_registry.hpp
+++ b/src/catch2/internal/catch_exception_translator_registry.hpp
@@ -11,7 +11,6 @@
 #include <catch2/interfaces/catch_interfaces_exception.hpp>
 #include <catch2/internal/catch_unique_ptr.hpp>
 
-#include <vector>
 #include <string>
 
 namespace Catch {
diff --git a/src/catch2/internal/catch_is_permutation.hpp b/src/catch2/internal/catch_is_permutation.hpp
index c77a6d3b..2bde03b8 100644
--- a/src/catch2/internal/catch_is_permutation.hpp
+++ b/src/catch2/internal/catch_is_permutation.hpp
@@ -8,7 +8,6 @@
 #ifndef CATCH_IS_PERMUTATION_HPP_INCLUDED
 #define CATCH_IS_PERMUTATION_HPP_INCLUDED
 
-#include <algorithm>
 #include <iterator>
 
 namespace Catch {
diff --git a/src/catch2/internal/catch_istream.cpp b/src/catch2/internal/catch_istream.cpp
index 2867ce74..717da0e7 100644
--- a/src/catch2/internal/catch_istream.cpp
+++ b/src/catch2/internal/catch_istream.cpp
@@ -14,8 +14,6 @@
 
 #include <cstdio>
 #include <fstream>
-#include <sstream>
-#include <vector>
 
 namespace Catch {
 
diff --git a/src/catch2/internal/catch_sharding.hpp b/src/catch2/internal/catch_sharding.hpp
index 22561f4b..4d7ee269 100644
--- a/src/catch2/internal/catch_sharding.hpp
+++ b/src/catch2/internal/catch_sharding.hpp
@@ -9,7 +9,6 @@
 #define CATCH_SHARDING_HPP_INCLUDED
 
 #include <cassert>
-#include <cmath>
 #include <algorithm>
 
 namespace Catch {
diff --git a/src/catch2/internal/catch_stringref.cpp b/src/catch2/internal/catch_stringref.cpp
index 232498eb..5b593545 100644
--- a/src/catch2/internal/catch_stringref.cpp
+++ b/src/catch2/internal/catch_stringref.cpp
@@ -10,7 +10,6 @@
 #include <algorithm>
 #include <ostream>
 #include <cstring>
-#include <cstdint>
 
 namespace Catch {
     StringRef::StringRef( char const* rawChars ) noexcept
diff --git a/src/catch2/matchers/catch_matchers_contains.hpp b/src/catch2/matchers/catch_matchers_contains.hpp
index 877d6924..951b42be 100644
--- a/src/catch2/matchers/catch_matchers_contains.hpp
+++ b/src/catch2/matchers/catch_matchers_contains.hpp
@@ -11,7 +11,6 @@
 #include <catch2/matchers/catch_matchers_templated.hpp>
 #include <catch2/internal/catch_move_and_forward.hpp>
 
-#include <algorithm>
 #include <functional>
 
 namespace Catch {
diff --git a/src/catch2/matchers/catch_matchers_range_equals.hpp b/src/catch2/matchers/catch_matchers_range_equals.hpp
index 8130f604..4c3c1d0b 100644
--- a/src/catch2/matchers/catch_matchers_range_equals.hpp
+++ b/src/catch2/matchers/catch_matchers_range_equals.hpp
@@ -11,9 +11,6 @@
 #include <catch2/internal/catch_is_permutation.hpp>
 #include <catch2/matchers/catch_matchers_templated.hpp>
 
-#include <algorithm>
-#include <utility>
-
 namespace Catch {
     namespace Matchers {