The Global Marijuana March (GMM) is a yearly rally taking place at different locations across the world. It refers to cannabis-related events that happens on the first Saturday in May, or thereabouts, and may include marches, meetings, rallies, raves, concerts, festivals and information tables.

The Global Marijuana March also goes by the name of the Million Marijuana March (MMM). It began in 1999. Around 600 different cities worldwide have signed up since 1999. There are local names for the event too, such as: World Cannabis Day, Cannabis Liberation Day, Global Space Odyssey, Ganja Day, J Day, Million Blunts March and more.

The 13th annual Global Marijuana March was organized to celebrate marijuana for both medical and recreational uses.

Nearly 500 cities across the world has participated in marijuana marches and rallies this year.