Ruminah Sidek, also known as Mak Mah (born 7 December 1946) is a Malaysian actress. Ruminah is the mother of Adlin Aman Ramlie and the widow of actor and director A. R. Tompel. Ruminah began acting in the early 1960s. As a result of her marriage to five husbands including actor A. R. Tompel, she is blessed with six children, 14 grandchildren and a great-grandchild.

She is the winner of the Best Supporting Actress award at the 21st Malaysian Film Festival.