Martine Lignières-Cassou (; born 22 February 1952) is a French politician who was a member of the National Assembly for 20 years. She represented the 1st constituency in the Pyrénées-Atlantiques department, and is a member of the Socialist Party and of the Socialiste, radical, citoyen et divers gauche parliamentary group. She was the mayor of Pau, Pyrénées-Atlantiques from 2008 to 2014. In the 1970s she was a member of the Revolutionary Communist League (LCR) before joining the Socialist Party in 1975.
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