- Source: List of Pioneer League champions
- Daftar julukan kota di Amerika Serikat
- List of Pioneer League champions
- Pioneer League (baseball)
- UEFA Champions League
- Pokémon: Johto League Champions
- List of California League champions
- List of Appalachian League champions
- League of Ireland
- List of Eastern League champions
- List of Pioneer Football League standings
- History of the European Cup and UEFA Champions League
The Pioneer League is an independent baseball league in the United States. From 1939 to 2020, it was part of affiliated Minor League Baseball. A league champion is determined at the end of each season. Champions have been determined by postseason playoffs or winning the regular season pennant. Currently, the first- and second-half winners within each division, North and South, meet in a best-of-three series to determine division champions. Then, the North and South division winners play a best-of-three series to determine a league champion.
League champions
Series and finalist information is only presented when postseason play occurred; the lack of this information indicates a declared league champion.
Championship wins by team
Active Pioneer League teams appear in bold.