She is the 2016 Olympic All-around Champion, two-time (2015, 2014) World All-around silver medalist, the 2015 European Games All-around silver medalist, the 2016 European Championships All-around silver medalist, three-time (2015, 2014, 2013) Grand Prix Final All-around champion and a three-time (2011–2013) Russian National All-around Champion.

She is the current Record Holder under the 20-point judging system with the highest All-around total of 77.150 points; which she scored at the 2016 Baku World Cup. At the 2016 Olympic Games, Mamun won the all-around gold setting a new Olympic Record under the 20 point judging system with a total score of 76.483 points, surpassing the previous mark score of Evgenia Kanaeva.

Margarita was born in Moscow, Russia to a Bangladeshi father and Russian mother. Her father, Abdullah Al Mamun, (a Russian national after settling down in Moscow) had a master's degree in marine engineering, while her mother, Anna, is a former rhythmic gymnast. Rita used to hold both Russian, and Bangladeshi citizenship. However, because of Russian constitutional laws, she now solely holds citizenship of the Russian Federation.(Russian law allows dual citizenship) She has one younger brother named Filipp Al Mamun. Her father's birthplace is Kashipur, Durgapur, Rajshahi, Bangladesh. On 26 August 2016, Rita's father Abdullah died from cancer, days after she won gold at the Olympic Games.

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