Rajkumar (Kannada: ಡಾ. ರಾಜಕುಮಾರ್), (born Singanalluru Puttaswamayya Muthuraju, April 24, 1929 - April 12, 2006) was an actor and singer in Kannada film industry. He acted in more than 200 Kannada movies. He mainly worked in Karnataka and has won awards for his work.

He was called "Dr. Raj" and "Natasarvabhouma" (meaning emperor of acting) and was popular in both Karnataka and other Indian states. His primary view about his fans was "I don't know whether I will ever see God. But for me all those who are assembled here are my Gods." .