Ada Del Moro Katz (born 1928 in Bronx, New York) is the wife and model of Alex Katz.
She graduated from Brooklyn College with a BS in 1950. She studied at the University of Maryland, and graduated from New York University with an MS in biology in 1955. She worked at Memorial Sloan–Kettering Cancer Center. She was a Fulbright Fellow to University of Milan.
She married Alex Katz on 1 February 1958.
In 1979, she co-founded the Eye and Ear Theater.
They donated the bulk of his work to the Colby College Museum of Art.
Her papers are in the Archives of American Art.