Karl Johan (K. J.) Gabrielsson (1861–1901) was a Swedish socialist writer and poet. The son of a railway worker, he was born to a poor family in Töreboda, Västra Götaland County, Gabrielsson eventually settled in Stockholm where he became a socialist and writer, mainly of revolutionary poems, for the newspaper Social-Demokraten. He died from tuberculosis in 1901 following a long illness. Gabrielsson is the subject a biography written by the radical journalist Ture Nerman.