In folklore, a hobby horse is a costumed character that features in some traditional seasonal customs, processions and similar observances around the world. In England, they are particularly associated with May Day celebrations, mummers' plays and the Morris dance.

Mummers' plays are folk plays performed by troupes of amateur actors, traditionally all male, known as mummers or guisers. Historically, mummers' plays consisted of informal groups of costumed community members that visited from house to house on various holidays. Today the term refers especially to a play in which a number of characters are called on stage, two of whom engage in a combat, the loser being revived by a doctor character. This play is sometimes found associated with a sword dance though both also exist in Britain independently.