John Pym (1584 – 8 December 1643) was an English parliamentarian, leader of the Long Parliament and a prominent critic of Kings James I and then Charles I. He was one of the Five Members whose attempted arrest by King Charles I in the House of Commons of England in 1642 sparked the Civil War. In addition to this Pym went ahead and started to accuse William Laud (the king's adviser) of trying to convert England back to Catholicism.