Maria Sergeyevna Gromova (; born February 28, 1988 in Moscow) is a Russian backstroke and relay swimmer, who was selected to the national team to qualify for the 2012 Summer Olympics in London. She competed in the women's 4 × 100 m medley relay, along with her teammates Yuliya Yefimova, Irina Bespalova, and Veronika Popova. She and her team placed eighth in the heats, with a time of 3:59.57, and qualified for the finals. Although she competed only as an alternate, Gromova supported her team in the finals, but missed out of the medal podium, finishing behind Japan in fourth place.