Peter Legh (c.1622/23^[1] – 2 February 1642) was an English politician who sat in the House of Commons between 1640 and his death in 1642. He died after fighting a duel.

Legh of Lyme Hall, Cheshire, was the grandson of Sir Peter Legh, MP for Wigan in 1586 and 1589. His father, Piers,^[2] died while he was a child and he succeeded to his grandfather's estates on 17 February 1636.^[3] He was sent to a grammar school at Amersham, Buckinghamshire under Dr Robert Challenor and then to Oriel College, Oxford,^[4] which he entered on 25 January 1638/39 aged sixteen.^[2]

In November 1640, Legh, aged about seventeen,^[4] was elected Member of Parliament for Newton in the Long Parliament.^[5] On 27 January 1642 he attended a play and after a mistaken piece of horseplay was injured in a duel by Valentine Browne, a student of Gray's Inn and nephew of Lord Herbert of Cherbury,^[4] and died six days later^[6] at a lodging in Acton, Middlesex.^[7] He was buried at Winwick, Cheshire.^[4]