Mari Johanna Hynynen (born 10 March 1970 in Varkaus), known as Mari Perankoski, is a Finnish actress. She is best know for her roles in television series Roba, Syke, Ihmisten puolue, Putous and Kontio & Parmas. She has also appeared in films such as Road North, The Grump and Reunion 3: Singles Cruise.

She is married to a metal musician Jouni Hynynen.