Grethe Sønck (16 July 1929 – 12 February 2010)was a Danish actress and singer.
She was born as Grethe Ingeborg Nielsen Hald in Hjerm, near Struer, but she changed her surname to Sønck in 1968.
In 1946, she won a talent contest, and in 1947, she became a singer at the Restaurant Sommerlyst at Dyrehavsbakken.
As a revue actress, she started in Cirkusrevyen at Dyrehavsbakken in 1962, and later came to Nykøbing Falster Revue.