Mummers Plays (also known as mumming) are seasonal folk plays performed by troupes of actors known as mummers or guisers (or by local names such as rhymers, pace-eggers, soulers, tipteerers, galoshins, guysers, and so on), originally from England (see wrenboys), but later in other parts of the world. They are sometimes performed in the street but more usually as house-to-house visits and in public houses. Although the term "mummers" has been used since medieval times, no play scripts or performance details survive from that era, and the term may have been used loosely to describe performers of several different kinds. Mumming may have precedents in German and French carnival customs, with rare but close parallels also in late medieval England (see below).

The earliest evidence of mummers' plays as they are known today (usually involving a magical cure by a quack doctor) is from the mid to late 18th century. Mumming plays should not be confused with the earlier mystery plays.

Mummers' and guisers' plays were formerly performed throughout most of English-speaking Ireland, Europe and Great Britain, as well as in other English-speaking parts of the world including Newfoundland, Kentucky and Saint Kitts and Nevis. In England, there are a few surviving traditional teams, but there have been many revivals of mumming, often associated nowadays with morris and sword dance groups.

The Mummers are a band based in the English seaside town of Brighton, centred around London-born singer/songwriter Raissa Khan-Panni, composer Mark Horwood (before his suicide in September 2009), producer/writer Paul Sandrone and co-producer/manager Alastair Cunningham. They take their name 'Mummers' from the medieval performing troupes who would go from door-to-door wearing masks and costumes, staging plays in rhyme and song and mime.

Khan-Panni, once better known as Raissa, is a singer whose origins include English, Chinese, Indian, and Mexican. She was raised in the South London district of West Norwood, and as a child studied classical music, learning the piano and then oboe. She spent her school-days busking in Leicester Square and later all over Europe, before returning to study music in Bristol. In 2000 she enjoyed critical acclaim across the media spectrum, most notably with the album Believer released by Polydor Records and the single "How Long Do I Get" which was played extensively on UK radio stations.