Gemma Stevens (nee Tattershall) is a British eventing rider whose successes to date include helping the British team to win gold at the 2018 World Championships. She also took gold at the 2021 Bicton Horse Trials (a one-off event held to replace the two major UK horse trials that were cancelled due to Covid in 2020). She has previously won medals at the Badminton Horse Trials, Burghley Horse Trials, and Étoiles de Pau. She also represented Great Britain at the 2016 Olympics in Rio de Janeiro. She competed as Gemma Tattershall until her 2022 marriage, and when she’s not competing, she runs a stable in Sussex.

Stevens was born in March 1985 and enjoyed her first taste of international success when she helped the British team to win gold at the Young Rider Championships in 2005 and 2006. She became national under-25 champion in 2010. She made her senior international debut at the 2015 European Championships, and having previously been selected for an Olympic development programme, was selected to be a part of Team GB at the 2016 Games. She helped the British team to a fifth-place finish in Rio and finished 41st in the individual category.

Riding Arctic Soul, Stevens won bronze at the 2016 Badminton Horse Trials in South Gloucestershire and another bronze at the Burghley Horse Trials in Lincolnshire. Riding Pamero 4, she took silver at the Étoiles de Pau in the South of France in 2018. With the Badminton and Burghley events both falling victim to the 2020 pandemic, a one-off event, the Bicton Horse Trials, was held in Devon in 2021, and Stevens won her first gold medal on Chilli Knight.