Aleksandra Sergeyevna Troitskaya (Russian: Алекса́ндра Серге́евна Тро́ицкая; 1896–1979) was a Soviet microbiologist-leprologist, candidate of medical sciences.

[3] Troitskaya was born in Bryankovo (now in Suvorovsky District of Tula Oblast), grew up in Kaluga.

[3] In 1917 she graduated from the Kaluga Diocesan School (she also studied with Konstantin Tsiolkovsky).

[4] In 1946, at the Kazan Federal University, she defended her thesis on pain biotherapy in the treatment of leprosy.

[5] Since 1951 (after retirement) she worked as a microbiologist in the laboratory of the Kaluga Oncologic Dispensary.