Mervyn "Muff" Winwood (born 15 June 1943, Erdington, Birmingham, England) is an English songwriter and record producer.

The elder brother of Steve Winwood, both were members of The Spencer Davis Group in the 1960s, in which Muff played bass guitar.

Winwood's father, Lawrence, was a foundryman by trade, who also played tenor saxophone in dance bands and had a collection of jazz and blues records.

After leaving the Spencer Davis Group in 1967, Winwood moved within the music industry to a position as A&R man at Island Records.

[5] As part of his A&R duties, Winwood signed Prefab Sprout, Terence Trent D'Arby, Sade, Shakin' Stevens and The Psychedelic Furs amongst others.