Janet Behan (22 July 1954) is an English writer and actress.
Behan was born in London, the daughter of Dublin-born playwright Brian Behan & Celia Behan, great niece of the songwriter Peadar Kearney (author of Amhrán na bhFiann, the Irish National Anthem), and niece of the writers Brendan Behan and Dominic Behan. Her husband is the television director Dermot Boyd. Her siblings include journalist Rosemary Behan,  writer and musician Ruth Behan,  and poet Daniel Tobias Behan .
Behan trained first as an actress at the Central School of Speech and Drama, and appeared in numerous theatrical plays and on television, including a role in Eastenders and productions at the National Theatre.
In 2016, Behan premiered her new one-woman play 'Realtine / Noreen' at the Camden Fringe, Tristan Bates theatre.