The Full Moon Party is an all-night beach party that takes place in Haad Rin on the island of Koh Phangan, Thailand on the night of every full moon.

The first Full Moon Party was improvised at a wooden disco not far from the beach in 1985 for giving thanks to about 20-30 travelers. The Full Moon Party gained fame quickly through word of mouth, and the event now draws a crowd about 20,000-30,000 every full moon evening. The party carries on until the sun rises the next day. All the bars on the sunrise beach of Haad Rin town stay open and play music such as R&B, drum and bass, house, dance and reggae.

The modern event has become a part of the itinerary of many travelers to Asia. It is characterized by unruly and potentially dangerous attractions such as fire skipping ropes, wildly variable alcohol strength 'buckets', and a drug culture. It is indeed seen by many as the "ultimate party experience" (Lonely Planet), although drug laws are still strict, and police enforcement is stepped up during the parties (Lonely Planet).

The Full Moon Party is featured in films such as Last Stop for Paul and the Thai film Koh Phangan is located to the north of Koh Samui and is reached from Bang Rak Beach by speed boat shuttle during the Full Moon Party period. Most guest chose to stay at a resort in Samui and just go back and forth to Phangan for the party.