The San Diego Legion were an American professional rugby union team based in San Diego, California, that competed in Major League Rugby (MLR) from 2020 to 2025. The team played its home games at Torero Stadium. The Legion began play in the league's inaugural 2018 season.
Established in 2017, the San Diego Legion have represented San Diego since their inception. The Legion are one of seven founding teams in Major League Rugby. The Legion began play at Torero Stadium on the campus of the University of San Diego for the 2018 season.
On February 2, 2022, the Legion announced Snapdragon Stadium to be their new home beginning in 2023. On November 19, 2024, the team announced plans to leave Snapdragon Stadium to return to Torero Stadium. Playoff games may be hosted at Snapdragon Stadium depending on demand.
The Legion were runner-ups in the 2019 and 2023 season championships.
In July 2025 it was announced that San Diego Legion and Rugby Football Club Los Angeles would merge to form a single, statewide rugby franchise, The California Legion.
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On March 12, 2020, MLR announced the season would go on hiatus immediately for 30 days due to fears surrounding the COVID-19 pandemic. It was canceled the following week