McKayla Rose Maroney (born December 9, 1995) is an American retired artistic gymnast. She was a member of the American women's gymnastics team dubbed the Fierce Five at the 2012 Summer Olympics, where she won a gold medal in the team and an individual silver medal in the vault event. Maroney was also a member of the gold-winning American team at the 2011 World Championships, where she won gold medals in the team and vault competitions. She defended her World title and won the gold medal on vault at the 2013 World Championships, becoming the first U.S. female gymnast to defend a World Championship vault title.

A photograph of her with a "not impressed" expression, taken after winning silver in the 2012 Olympics, became an Internet meme. In 2016, she retired from competitive gymnastics.

On October 18, 2017, Maroney alleged that the USA Gymnastics team physician Larry Nassarhad repeatedly molested her, starting when she was 13 years old, until her retirement from the sport in 2016. She made the allegation on Twitter under the #MeToo hashtag. Nassar had been arrested in November 2016 and accused of sexually assaulting female minors throughout his career.

In December 2017, Maroney filed a suit against Nassar, Michigan State University, the United States Olympic Committee and USA Gymnastics accusing the latter two of covering up the sexual abuse by asking Maroney to sign a $1.25 million confidentiality agreement. Maroney agreed and accepted the money. During Nassar's sentencing hearing, USA Gymnastics waived the agreement, at least temporarily, to allow Maroney to make a victim's statement in court against Nassar, who is now serving a 40-to-175-year prison sentence.

On May 16, 2018, it was announced that Maroney and the other victims would be awarded the Arthur Ashe Courage Award.