Britta Gröndahl (March 8, 1914 – November 18, 2002) was a Swedish writer, French language teacher, editor, translator, and anarcho-syndicalist. A well-known libertarian labour militante, she remained active in the movement well into her old age. She dedicated a major part of her life to the Swedish syndicalist movement, being particularly active in the Central Organisation of the Workers of Sweden (SAC), where she rose to become the union's first International Secretary (1968—1972) and engaged herself in practical solidarity work for the then-underground anarcho-syndicalist movements on the Iberian peninsula. She also played an important role in revitalizing the Swedish Syndicalist League of Women, which, up until then, had been relegated to a relatively minor role by the male-dominated mo