"Market Square Heroes" is the debut single by the British neo-prog band Marillion, released in October 1982 with "Three Boats Down from the Candy" as the B-side. The 12-inch single included an additional track, the 17:15-minute-long "Grendel".

Marillion are a British neo prog band, formed in Aylesbury, Buckinghamshire, in 1979. They emerged from the post-punk music scene in Britain and existed as a bridge between the styles of punk rock and classic progressive rock, becoming the most commercially successful neo-prog band of the 1980s.