Augustina Stanislavovna Gabel (Ukrainian: Августина Станіславівна Габель, romanized: Augustyna Stanislavivna Habel; née Sinkevich; born 30 August 1853 – 29 March 1907) was a librarian and revolutionary from the Russian Empire.

After receiving her education, she became involved in revolutionary activities, joining the Narodnik movement, which aimed to promote socialist ideas among the Russian peasantry.

Augustina Sinkevich[b] was born on 30 August 1853 in Saint Petersburg into the family of a Russified Pole, Titular Councillor [ru] Stanislav Vikentiyovych Sinkevych.

Researcher Sofia Sholomova [uk] suggested that Augustina provided financial assistance to people in Chuhuiv, including the artist Ilya Repin, whom she had known since childhood.

At the suggestion of the circle member Grigori Machtet, on 15 August 1876, Gabel, Nadezhda Bantle and Alexander Klushin [ru] took compromising materials from the apartment of the recently arrested Yevhenia Bartoshevich.

[11][12][1] In mid-June 1878, she voluntarily went into exile with her husband to Eastern Siberia, having previously obtained permission from Alexander Timashev, the Minister of the Interior.

[13][1] Ukrainian historian Olga Nikolayenko pointed out the similarity of the figures of Augustyna Gabel and another Polish woman, Valeria Bilokonska, head of the Kharkiv branch of the Society for Mutual Aid of Working Women [uk].

An important factor that helped women overcome all the trials of the difficult conditions of exile, according to the researcher, was the presence of faithful husbands who loved them and thanks to which the wives could focus on family life.

[14] At the end of Orest Gabel's exile, he and Augustina left Siberia and arrived in Kharkiv in August 1887, where the couple were placed under secret surveillance.

Augustina actively engaged in the cultural life of the city, and alongside her husband, contributed to the initiatives of the Kharkiv Society for the Promotion of Literacy among the People [uk].

The aspiring artist, then still a student at the Imperial Academy of Arts, sketched Augustina at the age of fifteen during a literary evening on April 21, 1869.

The pencil sketch was preserved in the Gabel family for a long time until Margarita, Augustina's daughter, donated it to the Kharkiv Art Museum.

[24] The drawing depicts a young girl dressed in a gown with a cape, emphasizing her slender figure, sloping shoulders, and graceful neck.

Art historian Maryana Chernova noted that Augustina appears anxious in the portrait, as if she had only briefly and tensely seated herself on the chair.