Antonia San Juan Fernández (born 22 May 1961) is a Spanish actress, director and screenwriter.

Biography
She was born in Las Palmas de Gran Canaria, Spain. At 19 she went to Madrid, where she started working as a professional theatre actress and also as a cabaret act in pubs and bars. She became known thanks to her role as Agrado in Todo sobre mi madre by Pedro Almodóvar. She is well known in Spain not only because of her film career but also for her humorous monologues on television and theatre. Since 2009 she has been acting in the popular Spanish TV series La que se avecina, playing the part of Estela Reynolds, the eccentric mother of Lola.

She is an atheist and is highly critical of religion, calling it a "cancer to society."