Amanda Limborco Alcântara Ribas (born August 26, 1993) is a Brazilian professional mixed martial artist. She currently competes in the women's Strawweight and Flyweight divisions of the Ultimate Fighting Championship (UFC).

The Varginha native is the daughter of Marcelo Ribas, a judo and Jiu-jitsu coach who also teaches Muay Thai. She trained under her father until she was part of one of the national judo youth teams in Brazil. She stopped training and competing for some years after suffering knee injuries. She started to train and compete again after seeing some of her colleagues training for an MMA tournament.

I was born on the mat. It was for me. There was a time when I stopped grappling for dancing. My father wanted to die.

After winning 2014 IMMAF World Championship in the Women's Flyweight division, Ribas started her professional MMA career in 2014 and fought primarily in Brazil. She amassed a record of 6–1 prior to being signed by UFC.

Ribas was scheduled to face Juliana Lima at The Ultimate Fighter 25 Finale on July 7, 2017. However, Ribas was flagged by USADA for a potential anti-doping violation and removed from the bout. The possible violation stems from a sample collected June 7. She was replaced by Tecia Torres. She initially received a two-year sanction by USADA after testing positive for Ostarine, but the suspension was terminated on May 3, 2019 as USADA determined that the positive test was the result of an ostarine contaminated dietary supplement.

In her UFC debut, Ribas faced Emily Whitmire on June 29, 2019, at UFC on ESPN 3. She won the fight via a rear-naked choke submission in the second round.

On October 12, 2019, Ribas faced Mackenzie Dern at UFC Fight Night 161. She won the fight via unanimous decision.

Ribas was scheduled to face Paige VanZant on March 14, 2020 at UFC Fight Night 170. However, VanZant was forced to pull out of the fight due to fracturing her right arm, and she was replaced by Randa Markos. She won the fight via unanimous decision.