The 1978 Gillette Cup was the sixteenth Gillette Cup, an English limited overs county cricket tournament.
[1] The tournament was won by Sussex County Cricket Club who defeated Somerset County Cricket Club by 5 wickets in the final at Lord's.
The seventeen first-class counties, were joined by five Minor Counties: Devon, Durham, Shropshire, Staffordshire and Suffolk.
The winners in the second round then progressed to the quarter-final stage.
Winners from the quarter-finals then progressed to the semi-finals from which the winners then went on to the final at Lord's which was held on 2 September 1978.