David "Clem" Clempson (born 5 September 1949) is an English rock guitarist who has played in a number of bands, including Colosseum and Humble Pie.

Although he played in Marriott's All Stars,[1] he opted in 1980 not to join the reformed Humble Pie, choosing instead Jack Bruce & Friends.

In 1977, Clempson formed the short lived band Rough Diamond with former Uriah Heep singer David Byron.

Clempson has appeared as a guest musician with Jack Bruce, Billy Cobham and Dave Sancious, Roger Waters, Manfred Mann's Earth Band, Bob Dylan, Chris de Burgh, Kiri te Kanawa and Karl Jenkins (on Kiri Sings Karl, 2006),Greenslade and Jon Anderson.

In 2020 he was part of the reformed Colosseum alongside Mark Clarke, Chris Farlowe, Malcolm Mortimore, Adrian Askew and Kim Nishikawara.