Carnival is a festive season which occurs immediately before Lent; the main events are usually during February. Carnival typically involves a public celebration or parade combining some elements of a circus, mask and public street party. People often dress up or masquerade during the celebrations, which mark an overturning of daily life.

Carnival is traditionally held in Catholic and, to a lesser extent, Eastern Orthodox societies. Protestant areas usually do not have Carnival celebrations or have modified traditions, such as the Danish Carnival or other Shrove Tuesday events. The Brazilian Carnival is one of the best-known celebrations today, but many cities and regions worldwide celebrate with large, popular, and days-long events. The Carnival in Rio de Janeiro is the largest carnival in the world, according to the Guinness World Records.