Four hundred people from around the world got naked and ran into the sea at Rhossili Beach in Swansea, Wales, at 8 a.m. Sunday, WalesOnline.com reported.
Organizers of the event said the biggest challenge was getting verified by Guinness, but they are confident they beat the previous record of 250 skinny dippers.
Some of the skinny dippers also happened to be sponsored, and raised more than $8,000 for the Marie Curie cancer charity.
"The dash from the shoreline into the waves was the hardest bit but once you are in the water -- what the hell!" said Steve Absalom, 29. "I'm very proud to have helped to set the new world record. It is something I will be able to tell my grandchildren."