Ruth Valborg Maria Gustafson née Pettersson (Stockholm, 8 July 1881 – 5 April 1960,Stockholm), was a Swedish politician (Social Democrat), union worker, women's rights activist and editor.
She was a member of the Stockholm city council in 1919–1938, a member of the second chamber of parliament in 1933–1960, and editor of the social democratic paper Morgonbris 1908–1910 and 1919–1921.
She was a member of the National Association for Women's Suffrage in 1902–1921, and a speaker of the left wing within the movement.