Sir John Say, Kt. (died 12 April 1478) was an English courtier, MP and Speaker of the House of Commons.
In 1447 he entered Parliament as MP for Cambridge and was then in 1449 elected Knight of the Shire for Cambridgeshire, when he was also elected Speaker of the House of Commons. In June 1449 he was made Chancellor of the Duchy of Lancaster and in 1449 was appointed sheriff of Norfolk and Suffolk. By 1450, he was out of favor and in 1451 the Commons demanded his banishment from the court. However, he was pardoned in 1452.
From 1453 to 1478 he represented Hertfordshire in several Parliaments and was chosen to serve as speaker from 1463 to 1465 and again 1467 to 1468. In 1455 (until 1478 in three terms under [[Henry Bourchier, 1st Earl of Essex|Henry Bourchier, 1st Viscount Bourchier, 1st Earl of Essex) he held the post of under-Treasurer of the Exchequer and from 1476 that of Keeper of the Great Wardrobe.
He was made Knight of the Bath in 1465.
He died on 12 April 1478.
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