A1 sport league
This is a list of sport leagues designated A1. The entries are sorted by sport and by countries.
Sports
;Baseball- A1 [baseball league (Italy)]
- Class A1 (baseball), a defunct classification within Minor League Baseball
- 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)
- A1 [inline hockey league (Italy)], a league composed of eleven professional teams
- A1 [volleyball league (Greece)]
- A1 volleyball league (Italy)
- A1 volleyball league (Portugal)
- A1 [women's volleyball league (Portugal)]
- A1 [water polo league (Greece)]