Maria Adelaide Aglietta (4 June 1940 – 20 May 2000) was an Italian politician, deputy for the Radical Party between 1979 and 1985 (when she resigned) and 1987 to 1989. She was also a Member of the European Parliament from 1989 to 1999. Between 1 November 1990 and 18 July 1994 she was head of the Greens parliamentary group in the European Parliament.

Aglietta was born in Turin.