Bernard Derosier (born 10 November 1939 in Chevilly, Loiret) is a French politician. He was a long term member of the National Assembly of France, representing the Nord department from 1978 to 2012, as a member of the Socialist Party.
He represented Nord's 4th constituency from 1978 to 1986, then the whole department during the one term of proportional representation (1986-1988), then Nord's 2nd constituency from 1988 to 2012.