Mariya Borisovna Osipova (Belarusian: Марыя Барысаўна Осіпава, romanized: Maryja Barysaǔna Osipava, Russian: Мари́я Бори́совна О́сипова; 27 December 1908 – 5 February 1999) was a Soviet Belarusian partisan who provided Yelena Mazanik with the bomb she used to kill Wilhelm Kube, a high-ranking SS officer and the General-Commissar of Nazi-occupied Belarus.

Initially the organization printed anti-Axis leaflets, provided hiding for the city's Jews facing persecution, and helped Soviet prisoners of war escape from German custody.

After the group contacted a partisan detachment in 1941, the organization began conducting reconnaissance and sabotage missions against the German military.

[2][3] Osipova's best known accomplishment as a partisan was the assassination of high-ranking SS official and General-Kommissar of Nazi-occupied Belarus Wilhelm Kube, who oversaw the Minsk Ghetto.

In late 1941 the deputy commander of the "Dima" unit tasked Nadezhda Troyan with finding someone who worked inside Kube's house and would be willing to assist in a plot to kill him.

Troyan took a while to gain the trust of Mazanik, who was very afraid of betrayal, but after her sister Valentina confirmed the identity of Osipova for her she agreed to try to kill Kube.