Helena Krzemieniewska (1878–1966) was a Polish botanist and microbiologist, noted for studying myxobacteria and myxophyta in soil.

[5] Krzemieniewska was born 13 March 1878 in Lachowo, Poland, as the daughter of the wealthy landowner Ludwik Choynowski and Zofia Ciemieniewska.

After marrying the botanist and plant microbiologist Seweryn Krzemieniewski in 1899, she worked with him scientifically and expanded her knowledge at the universities in Delft, Holland and Leipzig, Germany.

[6] During the First World War, Krzemieniewska worked as a nurse in a military hospital and subsequently took part in the vaccination campaigns against typhus and smallpox.

From 1920 to 1924, she was deputy professor of botany at the Faculty of Forestry at Lwów Polytechnic, during which time she and her husband conducted research into the morphology and physiology of myxobacteria and slime molds.