Oscar Byström (31 December 1857 – 4 June 1938) was a Swedish actor.

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Byström debuted in 1884 at the Royal Dramatic Theatre. During 1885–1886, when he was involved in the theater company of Oscar Sternvall-Skottes . Byström was employed at the Royal Dramatic Theatre from 1890 to 1893. From 1907, he was as deputy director at the Vasateatern. His career in film started with a small role in Gösta Berlings saga (1924). He was married in 1896 to actress Constance Ericsson-Behrens (1868-1952).^[1][2]

• Gösta Berlings saga (1924)
• A Perfect Gentleman (1927)
• The Ghost Baron (1927)
• Jansson's Temptation (1928)
• The Girl from Värmland (1931)
• Markurells i Wadköping (1931)
• Modern Wives (1932)
• Dear Relatives (1933)
• Unfriendly Relations (1936)