Sir Peter de la Mare (died after 1387) was an English politician and Speaker of the House of Commons during the Good Parliament of 1376.
His parents were probably Sir Reginald de la Mare (died before 1358), of Yatton and Little Hereford in Herefordshire, and his wife Margery.
[4] Before becoming Speaker, de la Mare worked as a toll collector, was Sheriff of Herefordshire in 1374, and served as a steward to Edmund Mortimer, 3rd Earl of March.
In November 1376, de la Mare was imprisoned in Nottingham Castle by John of Gaunt.
Peter de la Mare is portrayed as the "rat of renown" who proposes belling the cat (who is probably John of Gaunt), thus casting him as a well-intentioned reformer who would not or could not follow through.