Keith Ian Ellis (19 March 1946 – 12 December 1978) was an English bass player.

[2] Ellis worked with Mike Patto and Ollie Halsall's band Boxer from 1975 until late 1976 when the original line-up split.

[3] Ellis died in Darmstadt, Germany in 1978, whilst on tour with Iron Butterfly.

No cause of death was determined,[3] although the music journalist Ralph Heibutzki reported in a 2011 edition of Ugly Things that he was the victim of an accidental drug overdose.

The song "Not For Keith" on the album pH7 by Peter Hammill, (1979) was a tribute to Ellis.