Peter Duffield (born 4 February 1969) is an English former professional footballer. A striker, he played for sixteen league clubs in 17 years. Duffield began his career as an 18-year-old with Sheffield United in 1987. In his time at Bramall Lane he made 58 league appearances and scored 16 goals, including a perfect penalty record of 7 scored from 7 taken which is a club record. Duffield also holds the club record for being the first Sheffield United substitute to be substituted after playing 14 minutes at Craven Cottage against Fulham on 29 April 1989. His last league start was on 10 December 1989 when he broke his leg at Swindon Town. He went on loan to six clubs in as many years, namely Halifax Town, Rotherham United, Blackpool, AFC Bournemouth, Crewe Alexandra and Stockport County.