Megan Elizabeth Barker (born 15 August 1997) is a Welsh professional racing cyclist who currently rides for Team Inspired. She was the 2023 National Circuit Race Champion. She represented Wales at the 2018 Commonwealth Games. She was part of the Great Britain squad which won gold in the team pursuit at the 2024 UCI Track Cycling World Championships in Ballerup, Denmark. Her elder sister, Elinor Barker, is also a professional cyclist.
Barker was part of the team pursuit line-up that won bronze at the 2025 UCI Track Cycling World Championships.