Marina Grigorievna Sidorova (Russian: Марина Григорьевна Сидорова-Никифорова, née Nikiforova; born 16 January 1950) is a Russian former Soviet track and field sprinter.

[3] Her greatest individual success came at the 1978 European Athletics Indoor Championships, where she won the women's 400 metres title.

[4] She took a 400 m bronze at the 1977 IAAF World Cup and was twice a 200 m silver medallist at the Universiade.

[7] With the Soviet women's relay team, she won four bronze medals at major competitions.

Her first came at the 1971 European Athletics Championships, alongside Lyudmila Zharkova, Galina Bukharina and Nadezhda Besfamilnaya.