A British blues band of the 1960s, notable mainly for the fact that so many of its members already were, or subsequently became, famous as individual musicians. It has been claimed as the UK's first supergroup, but it was not really that important and did not release any records.

Though the group played gigs at small venues around London as early as 1962, the nucleus of the band came together in mid 1965 after the break-up of Long John Baldry's previous group, the Hoochie Coochie Men. It included Hoochie Coochie Men vocalist Rod Stewart, vocalist Julie Driscoll, organist Brian Auger and guitarist Vic Briggs. They were managed by Giorgio Gomelsky, who had previously been involved with the Rolling Stones and the Yardbirds.

Steampacket played at various clubs, theatres and student unions around the country, including supporting the Rolling Stones on their 1965 British tour. However, because of contractual difficulties (Baldry was already signed to United Artists as a solo act), they never formally recorded a studio or live album. Tracks from tapes made at a rehearsal in the Marquee Club in London were released after the band split as an album, The First Supergroup, and some were later released by Charly as The Steampacket - Featuring Rod Stewart.

Stewart left in 1966 and the group disbanded soon after. Baldry pursued a solo pop career and had a Number 1 hit in the UK in 1967 with Let the Heartaches Begin. Driscoll, Auger and Briggs formed Brian Auger & the Trinity and had a UK hit in 1968 with This Wheel's on Fire. Stewart later sang with the Jeff Beck Group, the Faces and as a solo artist.