Peter "Spider" Stacy (born 14 December 1958 in Eastbourne) is an English musician. He is one of the founding members of London Irish band The Pogues.
Stacy got his start in music in London's punk scene during the late 1970s as frontman for The Millwall Chainsaws (latterly featuring a young Shane MacGowan on guitar) who later changed their name to The New Republicans. He is said to be the inspiration for Young Ones character Vyvyan. In 1981, he teamed up with Shane MacGowan again, Jem Finer and James Fearnley to form The Pogues and is credited with naming the band. Initially, his role was confined to co-vocals. As Shane became more confident as a front man, Stacy learned to play the tin whistle, which remained his role until the departure of MacGowan left him with lead vocal duties. He is unusual in that his playing style owes little, if anything, to the traditional Irish approach.
Stacy was with The Pogues until they disbanded in 1996, having provided lead vocals on The Pogues last two albums. During this time they had their biggest American single with the Stacy-penned Tuesday Morning which peaked at No. 11 on the Billboard Rock Chart. It was the highest placed single that The Pogues had on their own in the UK charts hitting No. 18 in 1993. Their higher placed singles had guest musicians Kirsty MacColl and The Dubliners.