Clean Monday is also known as Ash or Green or Pure Monday, Monday of Lent. It is the Day that begins the season of Great Lent in Eastern Orthodox Churches.

Clean Monday refers to the leaving behind of sinful attitudes and non-fasting foods. Traditional foods this day include octopus, olives, and shrimp.

Clean(Ash or Green or Pure) Monday is a public holiday in Greece and Cyprus. People used to celebrate the day include flying kites, dancing, music.