Guy Pepper (born 15 April 2003) is an English professional rugby union player who plays as a flanker for Premiership Rugby club Bath and the England national team.

From Eggleston, in Teesdale, Pepper attended Barnard Castle School. He had to give up playing rugby for a time as a youngster due to developing arthritis.

Pepper gained a degree in Sport and Exercise Science at Durham University, partly completed remotely whilst playing professional rugby for Bath.

Pepper trained with the academy at Newcastle Falcons during the COVID-19 pandemic when matches were limited. In May 2021 Pepper signed his first professional contract with the Newcastle Falcons. He continued to train with Newcastle whilst completing a degree at Durham University.

Pepper scored three tries in his first seven appearances for Newcastle prior to signing a new two-year contract with the club in April 2023. In May 2024, he was nominated for Premiership Rugby Breakthrough Player of the Season.

In April 2024, Pepper agreed to join Bath Rugby from the 2024–25 season, on a three-year contract. He made a try-scoring league debut for Bath on 29 September 2024, in their opening Premiership Rugby fixture of the season, an away win at Leicester Tigers. In June 2025, he scored an individual try from the Leicester 22-metre line that was eventually chalked off before winning Man of the Match in a 23–21 victory over Leicester Tigers in the 2024–25 Premiership Rugby final.

Pepper has represented England at U18 level. In January 2023 he was named in the England U20 squad for the first time. In February 2024 he started for the England A team in a victory over Portugal.

On 10 March 2024, Pepper was called up to train with the senior England squad by coach Steve Borthwick for the conclusion of their 2024 Six Nations campaign.