Martha Karagianni (Greek: Μάρθα Καραγιάννη; 6 November 1939 – 18 September 2022) was a Greek film actress. She was born in Athens, but raised in Keratsini. She was one of the most popular Greek actresses of the 1960s. She starred in many films, 19 of which were produced by Finos Film. She had a relationship with Dimitrios Stefanakos, and she was married to Vasilis Konstantinou for many years.