Most rugby union Pro12 wins
- Who
- Ospreys
- What
- 4 total number
- Where
- Not Applicable
- When
- 2012
The most wins of the rugby union Pro12 competition is four by the Welsh side Ospreys (UK) in 2005, 2007, 2010 and 2012.
The Pro12, formerly known as the Celtic League and the Magners League is the pre-emininent professional domestic rugby union competition for teams in Ireland, Italy, Scotland and Wales.