The London Symphony Chorus is a large symphonic concert choir based in London, UK, consisting of over 150 amateur singers, and is one of the major symphony choruses of the United Kingdom. It was formed in 1966 as the LSO Chorus to complement the work of the London Symphony Orchestra (LSO). The LSC is today an independent self-run organisation governed by a council of nine elected representatives. It continues to maintain a close association with the LSO but also takes part in projects with other orchestras and organisations both in the UK and abroad. The LSC performs mainly with the LSO at the Barbican Centre in London as well as appearing at other concert venues around the UK and Europe and regularly at the Avery Fisher Hall, New York.

The London Symphony Orchestra (LSO) is a British symphony orchestra based in London. Founded in 1904, the LSO is the oldest of London's symphony orchestras. The LSO was created by a group of players who left Henry Wood's Queen's Hall Orchestra because of a new rule requiring players to give the orchestra their exclusive services. The LSO itself later introduced a similar rule for its members. From the outset the LSO was organised on co-operative lines, with all players sharing the profits at the end of each season. This practice continued for the orchestra's first four decades.