Henriëtte Adriana "Hetty" Blok (6 January 1920 – 6 November 2012) was a Dutch cabaret artist, singer, and actress who performed on the stage, on radio, and on television for more than five decades.

[1] Her career started shortly after World War II in cabaret, performing with established singers and musicians including Wim Sonneveld, Fien de la Mar, and Harry Bannink.

[4] Besides acting in movies and television series, she spent a lot of time on stage, singing popular music accompanied by musicians such as Cor Lemaire, Harry Bannink, Ruud Bos, and Bas Odijk.

[1] Blok remained active even in her old age; until 1998 she toured (accompanied by Bas Odijk) with a solo show, Ziezo, containing songs by Annie M. G.

After retirement she appeared on radio shows and taught a generation of cabaret performers and singers, and made a guest appearance in January 2010 on De Wereld Draait Door,[5] where she sang the theme song from Ja zuster, nee zuster, oft repeated afterward on Dutch television.