Mayday is a 1978 board wargame published by Game Designers' Workshop. Mayday was part of a series produced by GDW called "Series 120" — games with 120 pieces that were designed to be learned and played in 120 minutes. It was the second boardgame to be published for Traveller. A second edition was published in 1980. It was republished in 2004 as part of Traveller: The Classic Games, Games 1-6+.