Sir John Byron (1386–1450) was an English nobleman, landowner, politician, and knight.
He was also an early ancestor of Ada Lovelace.
Byron married Margery Booth, daughter of John Booth, with whom he had six daughters and three sons, including Nicholas Byron, who was knighted by Prince Arthur in 1502.
Nicholas inherited his father's estates.
This article about a 15th-century member of the parliament of England is a stub.