Eva Wilhelmina Julia von Bahr-Bergius, (16 September 1874 – 28 February 1962) was a Swedish physicist and teacher at a folk high school.
She was the first woman in Sweden to become a docent in physics.
She is known for her contact with and support of the poet Dan Andersson, for her friendship and support of the physicist Lise Meitner, and as a Catholic writer.