Greg Peterson (born 26 March 1991) is an Australian-born USA international rugby union player currently with the San Diego Legion. He previously played for Glasgow Warriors. His regular playing position is lock. Peterson has played professionally in Australia and Europe. Peterson has played for the United States national rugby union team since 2014, including at the 2015 Rugby World Cup.
Following his season with the Rays, Peterson earned a trial with Leicester Tigers and eventually signed a contract that would keep him there until the end of the 2014–15 season, but he made only a few appearances for Leicester.[3]
On 19 March 2019, Peterson returned to England to join with Newcastle Falcons in the Premiership Rugby on a two-year deal from the 2019-20 season.[9]
Peterson left Newcastle after the 2022-23 season.
[10]
He started the 2023-24 season with a short term contract with the Glasgow Warriors in the United Rugby Championship. He played the first 9 rounds of the URC and also played against Bayonne in a European Champions Cup match.
In 2024 he signed for the San Diego Legion in the MLR.