diff --git a/cmake/modules/CompileWarnings.cmake b/cmake/modules/CompileWarnings.cmake
index 911787d2ef..93b35b8abf 100644
--- a/cmake/modules/CompileWarnings.cmake
+++ b/cmake/modules/CompileWarnings.cmake
@@ -4,4 +4,12 @@ macro(wpilib_target_warnings target)
     else()
         target_compile_options(${target} PRIVATE /wd4146 /wd4244 /wd4251 /wd4267 /WX /D_CRT_SECURE_NO_WARNINGS ${WPILIB_TARGET_WARNINGS})
     endif()
+
+    # Suppress C++-specific OpenCV warning; C compiler rejects it with an error
+    # https://github.com/opencv/opencv/issues/20269
+    if(UNIX AND NOT APPLE)
+        target_compile_options(${target} PRIVATE $<$<COMPILE_LANGUAGE:CXX>:-Wno-deprecated-enum-enum-conversion>)
+    elseif(UNIX AND APPLE)
+        target_compile_options(${target} PRIVATE $<$<COMPILE_LANGUAGE:CXX>:-Wno-deprecated-anon-enum-enum-conversion>)
+    endif()
 endmacro()
diff --git a/shared/config.gradle b/shared/config.gradle
index a565026cc6..097dc0ad88 100644
--- a/shared/config.gradle
+++ b/shared/config.gradle
@@ -43,6 +43,16 @@ nativeUtils.platformConfigs.each {
     }
 }
 
+// Suppress OpenCV warning
+// https://github.com/opencv/opencv/issues/20269
+nativeUtils.platformConfigs.each {
+    if (it.name == 'linuxx86-64') {
+        it.cppCompiler.args.add("-Wno-deprecated-enum-enum-conversion")
+    } else if (it.name == 'osxx86-64' || it.name == 'osxarm64') {
+        it.cppCompiler.args.add("-Wno-deprecated-anon-enum-enum-conversion")
+    }
+}
+
 nativeUtils.platformConfigs.linuxathena.linker.args.add("-Wl,--fatal-warnings")
 
 model {