Rayanne Amanda dos Santos (born 8 June 1995) is a Brazilian mixed martial artist, currently competing in the strawweight division of the Ultimate Fighting Championship (UFC). She also fought in Invicta FC, where she was the atomweight champion.

Amanda comes from a jiu-jitsu family, with her parents and brothers all being black belts. Training since she was seven years old, Rayanne went beyond the sport and ended up migrating to MMA. Amanda has a degree in social work, running a social project for children in Brazil, but had to close it to focus on MMA. After training in Brazil most of her life, Amanda moved to Houston to live with her fiancee, fellow MMA fighter Kolton Englund.

Dos Santos started her professional MMA career in 2015 and mainly fought in Brazil and Canada. She amassed a record of 12–6 prior to being signed by Invicta.

Amanda was scheduled to fight Edna Oliveira Ajala at Shooto Brasil 101. She won the fight by unanimous decision.

Amanda was next scheduled to fight Maiara Amanajas dos Santos at Shooto Brasil 106. She won the fight by unanimous decision.

Amanda faced Denise Gomes at Dana White's Contender Series 51 on August 23, 2022. She lost the fight via unanimous decision.

In her Invicta debut, dos Santos faced Katie Saull at Invicta FC 51 on January 18, 2023. She won the fight via unanimous decision.

Dos Santos faced the reigning atomweight champion Jillian DeCoursey on May 3, 2023, at Invicta FC 53: DeCoursey vs. Dos Santos. She won the title fight by unanimous decision to win the atomweight championship.