This is a list of sport leagues designated A1. The entries are sorted by sport and by countries.
Baseball A1 baseball league (Italy) Class A1 (baseball), a defunct classification within Minor League Baseball
Basketball A1 basketball league (Albania), the first professional league A1 basketball league (Bosnia and Herzegovina) A1 basketball league (Bulgaria), the second professional league A1 basketball league (Croatia) A1 basketball league (Greece)
Inline hockey A1 inline hockey league (Italy), a league composed of eleven professional teams
Volleyball A1 volleyball league (Greece) A1 volleyball league (Italy) A1 volleyball league (Portugal) A1 women's volleyball league (Portugal)
Water polo A1 water polo league (Greece)