Rumiko Koyanagi (小柳ルミ子, Koyanagi Rumiko) is a Japanese actress and singer. She won the award for best new artist at the 13th Japan Record Awards and won the Japan Music Award in 1972. She won the award for best supporting actress at the 6th Japan Academy Prize for To Trap a Kidnapper and the award for best actress at the 7th Japan Academy Prize for Hakujasho.