diff --git a/icu4c/source/config.guess b/icu4c/source/config.guess
index 5d97ad160d..2e0ee94012 100644
--- a/icu4c/source/config.guess
+++ b/icu4c/source/config.guess
@@ -949,9 +949,15 @@ EOF
     Power*:Rhapsody:*:*)
 	echo powerpc-apple-rhapsody${UNAME_RELEASE}
 	exit 0 ;;
+    Power*:Darwin:*:*)
+	echo powerpc-apple-darwin${UNAME_RELEASE}
+	exit 0 ;;
     *:Rhapsody:*:*)
 	echo ${UNAME_MACHINE}-apple-rhapsody${UNAME_RELEASE}
 	exit 0 ;;
+    *:Darwin:*:*)
+	echo ${UNAME_MACHINE}-apple-darwin${UNAME_RELEASE}
+	exit 0 ;;
     *:OS/390:*:*)
 	echo ${UNAME_MACHINE}-ibm-os390${UNAME_RELEASE}
 	exit 0 ;;
diff --git a/icu4c/source/config.sub b/icu4c/source/config.sub
index fe8522594c..a777a673df 100644
--- a/icu4c/source/config.sub
+++ b/icu4c/source/config.sub
@@ -926,7 +926,7 @@ case $os in
 	      | -udi* | -eabi* | -lites* | -ieee* | -go32* | -aux* \
 	      | -cygwin* | -pe* | -psos* | -moss* | -proelf* | -rtems* \
 	      | -mingw32* | -linux-gnu* | -uxpv* | -beos* | -mpeix* | -udk* \
-	      | -interix* | -uwin* | -rhapsody* | -openstep* | -oskit*)
+	      | -interix* | -uwin* | -rhapsody* | -darwin* | -openstep* | -oskit*)
 	# Remember, each alternative MUST END IN *, to match a version number.
 		;;
 	-sim | -es1800* | -hms* | -xray | -os68k* | -none* | -v88r* \