Athanasia Gizili (Greek: Αθανασία Γκιζίλη, 14 May 1924 – 19 January 2025), better known professionally as Cathy Grey, was a Greek singer. Grey was born in the village of Mytilinioi in Samos and had three siblings.

She was adopted by the Kalaitzis family and grew up in Piraeus. Initially, she became an actress in Rita Tsakona's bands and later sang songs with Yiannis Vellas as well as other artists of the genre. Her role model was Tzimis Makoulis.