The 1978 Gillette Cup Final was a cricket match between Somerset County Cricket Club and Sussex County Cricket Club played on 2 September 1978 at Lord's in London. It was the sixteenth final of the Gillette Cup, which had been the first domestic tournament to pit first-class cricket sides against each other in a knock-out competition. This was Sussex's sixth appearance in the final, which they had previously won twice, while Somerset had lost in their only previous final.