diff --git a/doc/functionality.md b/doc/functionality.md
index d0c0600742e90fdd1cec6425280de95c8427e9cd..a9d7c45c05ff6cf6587be31f6d2fda07a67569ee 100644
--- a/doc/functionality.md
+++ b/doc/functionality.md
@@ -19,7 +19,7 @@ See `doc/opencv.md` for details of the functionality available in OpenCV.
 | SaturatingAddAbsWithThreshold|     |     |  x  |     |     |     |     |     |
 | Scale                        |     |  x  |     |     |     |     |     |     |
 
-## Colour conversions
+## Color conversions
 |           | u8  |
 |-----------|-----|
 | Gray-RGB  |  x  |
diff --git a/kleidicv/include/kleidicv/kleidicv.h b/kleidicv/include/kleidicv/kleidicv.h
index 63a9b27714169486c45aaafbd414019d806a4364..cb0381c23b314a00ee4bec749f5fdfd39e92b44a 100644
--- a/kleidicv/include/kleidicv/kleidicv.h
+++ b/kleidicv/include/kleidicv/kleidicv.h
@@ -408,7 +408,7 @@ KLEIDICV_API_DECLARATION(kleidicv_rgba_to_rgba_u8, const uint8_t *src,
 
 /// Converts an RGB image to BGRA. All channels are 8-bit wide.
 ///
-/// Corresponding colours are set while Alpha channel is set to 0xFF.
+/// Corresponding colors are set while Alpha channel is set to 0xFF.
 /// Destination data is filled as follows:
 /// | B,G,R,A | B,G,R,A | B,G,R,A | ...
 /// Each letter represents one byte of data, and one pixel is represented
@@ -434,7 +434,7 @@ KLEIDICV_API_DECLARATION(kleidicv_rgb_to_bgra_u8, const uint8_t *src,
 
 /// Converts an RGB image to RGBA. All channels are 8-bit wide.
 ///
-/// Corresponding colours are set while Alpha channel is set to 0xFF.
+/// Corresponding colors are set while Alpha channel is set to 0xFF.
 /// Destination data is filled as follows:
 /// | R,G,B,A | R,G,B,A | R,G,B,A | ...
 /// Each letter represents one byte of data, and one pixel is represented
@@ -460,7 +460,7 @@ KLEIDICV_API_DECLARATION(kleidicv_rgb_to_rgba_u8, const uint8_t *src,
 
 /// Converts an RGBA image to BGR. All channels are 8-bit wide.
 ///
-/// Corresponding colours are set while Alpha channel is discarded.
+/// Corresponding colors are set while Alpha channel is discarded.
 /// Destination data is filled as follows:
 /// | B,G,R | B,G,R | B,G,R | ...
 /// Each letter represents one byte of data, and one pixel is represented
@@ -486,7 +486,7 @@ KLEIDICV_API_DECLARATION(kleidicv_rgba_to_bgr_u8, const uint8_t *src,
 
 /// Converts an RGBA image to RGB. All channels are 8-bit wide.
 ///
-/// Corresponding colours are set while Alpha channel is discarded.
+/// Corresponding colors are set while Alpha channel is discarded.
 /// Destination data is filled as follows:
 /// | R,G,B | R,G,B | R,G,B | ...
 /// Each letter represents one byte of data, and one pixel is represented
diff --git a/test/api/test_rgb_and_gray.cpp b/test/api/test_rgb_and_gray.cpp
index 09ec2b500a9755df6142d5b3ea9a30cfe2a856ba..cdffcea9047e5fd0237df4015537bf07eff853c8 100644
--- a/test/api/test_rgb_and_gray.cpp
+++ b/test/api/test_rgb_and_gray.cpp
@@ -83,9 +83,9 @@ class GrayTest final {
   size_t outChannels_;
 };
 
-class ColourTest final {
+class ColorTest final {
  public:
-  ColourTest(size_t src_channels, size_t dst_channels, bool swapBlue)
+  ColorTest(size_t src_channels, size_t dst_channels, bool swapBlue)
       : inChannels_(src_channels),
         outChannels_(dst_channels),
         swapBlue_(swapBlue) {}
@@ -183,41 +183,41 @@ TEST(GRAY2, RGBA) {
 }
 
 TEST(RGB2, RGB) {
-  ColourTest colour_test(3, 3, false);
-  colour_test.execute_test(kleidicv_rgb_to_rgb_u8);
+  ColorTest color_test(3, 3, false);
+  color_test.execute_test(kleidicv_rgb_to_rgb_u8);
 }
 
 TEST(RGBA2, RGBA) {
-  ColourTest colour_test(4, 4, false);
-  colour_test.execute_test(kleidicv_rgba_to_rgba_u8);
+  ColorTest color_test(4, 4, false);
+  color_test.execute_test(kleidicv_rgba_to_rgba_u8);
 }
 
 TEST(RGB2, BGR) {
-  ColourTest colour_test(3, 3, true);
-  colour_test.execute_test(kleidicv_rgb_to_bgr_u8);
+  ColorTest color_test(3, 3, true);
+  color_test.execute_test(kleidicv_rgb_to_bgr_u8);
 }
 
 TEST(RGBA2, BGRA) {
-  ColourTest colour_test(4, 4, true);
-  colour_test.execute_test(kleidicv_rgba_to_bgra_u8);
+  ColorTest color_test(4, 4, true);
+  color_test.execute_test(kleidicv_rgba_to_bgra_u8);
 }
 
 TEST(RGB2, BGRA) {
-  ColourTest colour_test(3, 4, true);
-  colour_test.execute_test(kleidicv_rgb_to_bgra_u8);
+  ColorTest color_test(3, 4, true);
+  color_test.execute_test(kleidicv_rgb_to_bgra_u8);
 }
 
 TEST(RGB2, RGBA) {
-  ColourTest colour_test(3, 4, false);
-  colour_test.execute_test(kleidicv_rgb_to_rgba_u8);
+  ColorTest color_test(3, 4, false);
+  color_test.execute_test(kleidicv_rgb_to_rgba_u8);
 }
 
 TEST(RGBA2, BGR) {
-  ColourTest colour_test(4, 3, true);
-  colour_test.execute_test(kleidicv_rgba_to_bgr_u8);
+  ColorTest color_test(4, 3, true);
+  color_test.execute_test(kleidicv_rgba_to_bgr_u8);
 }
 
 TEST(RGBA2, RGB) {
-  ColourTest colour_test(4, 3, false);
-  colour_test.execute_test(kleidicv_rgba_to_rgb_u8);
+  ColorTest color_test(4, 3, false);
+  color_test.execute_test(kleidicv_rgba_to_rgb_u8);
 }