Kaj Chydenius (born 16 October 1939) is a Finnish composer probably best known for his political songs interpreted by various artists. He studied at the Sibelius Academy, the University of Helsinki and the Helsinki School of Economics, starting his career with avant-garde music, happening, instrumental theatre and the aesthetics of John Cage. Some of the best-known works by Chydenius are Lapualaisooppera (1966) and such songs as 'Sinua, sinua rakastan', 'Nuoruustango' and the children's song 'Magdaleena', which are all evergreens in Finland.

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