Katarina (Karin) Helena Fjällbäck-Holmgren (1881–1963) was a Swedish politician who was active in the areas of social welfare and women's suffrage.
She served as secretary and deputy chair of the Stockholm branch of the National Association for Women's Suffrage (LKPR).
She served on Stockholm's public school directorate in the 1920s and from 1931 chaired the city's welfare agency for children.
[1] In 1903, Fjällbäck began her professional life as a member of the board of the newly established CSA or Centralförbundet för Socialt Arbete, an organization designed to coordinate associations working on social welfare, primarily to offset poverty resulting from industrialization.
[1] On the political front, following the municipal suffrage reforms, from 1919 she participated actively in city council meetings, attracting an Idun commentator to write that she "had already managed to make herself known as an unusually accomplished and astute speaker".