The ISU Challenger Series is a series of international figure skating competitions. Established by the International Skating Union in the 2014–15 season, it is a group of senior-level events ranked below the ISU Grand Prix of Figure Skating. Each event consists of at least three disciplines out of four (men's singles, ladies' singles, pair skating, and ice dancing), and is required to take place between August 1 and December 15. The ISU Challenger Series Synchronized Skating is a separate competition series in the discipline of synchronized skating.