Leo Lyons (born David William Lyons on 30 November 1943, in Mansfield, Nottinghamshire, England) is an English rock musician, who was also the bassist of the British late 1960s to 70s rock group Ten Years After.
He first played with lead guitarist Alvin Lee in The Jaybirds. In 1967 there was a name change to Ten Years After. With this group, Lyons played at major rock festivals including Woodstock in 1969 and the Isle of Wight Festival on 29 August 1970. Ten Years After disbanded in 1976, although they later reformed several times in the 80's and 90's with all original members.
In 1975, he was hired as a studio manager by Chrysalis Records to re-equip and run Wessex Studios in London. He then produced UFO from 1974 to 1976. Later he started two commercial recording studios himself.
Lyons moved to Nashville, TN in the mid 90's and was a staff Songwriter for Hayes Street Music. He currently plays in a reformed Ten Years After with new frontman Joe Gooch.