Bommasandra Srinivasaiah Suryanarayana Murthy (16 March 1933 – 26 December 1985), known professionally as Uday Kumar, was an Indian actor, writer, and film producer who worked primarily in Kannada cinema. Along with Rajkumar and Kalyan Kumar, he was part of the trio known as the Kumarathrayaru ("the three Kumars") of Kannada cinema. In addition to acting, he wrote several stage dramas and books. Uday Kumar appeared in a wide variety of roles and collaborated with many notable actors of his era. In the early part of his career, he was cast in heroic roles, but he later became known for portraying complex antagonists, particularly in historical and mythological films, where he was frequently cast opposite Rajkumar’s protagonist roles.