diff --git a/.gitignore b/.gitignore
index 47c24b7c4b9..c3e15588c1f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -264,6 +264,13 @@ icu4c/source/tools/genfchk/Debug
 icu4c/source/tools/genfchk/Makefile
 icu4c/source/tools/genfchk/genfchk
 icu4c/source/tools/genfchk/genfchk.d
+icu4c/source/tools/genidna/*.d
+icu4c/source/tools/genidna/*.pdb
+icu4c/source/tools/genidna/Debug
+icu4c/source/tools/genidna/Makefile
+icu4c/source/tools/genidna/Release
+icu4c/source/tools/genidna/genidna
+icu4c/source/tools/genidna/genidna.8
 icu4c/source/tools/gennames/*.d
 icu4c/source/tools/gennames/*.pdb
 icu4c/source/tools/gennames/Debug
diff --git a/icu4c/source/tools/genidna/.cvsignore b/icu4c/source/tools/genidna/.cvsignore
new file mode 100644
index 00000000000..85a091cd5cf
--- /dev/null
+++ b/icu4c/source/tools/genidna/.cvsignore
@@ -0,0 +1,7 @@
+*.d
+*.pdb
+Debug
+Makefile
+Release
+genidna
+genidna.8