Tõnu Raadik (born December 15, 1957 in Jõhvi) is an Estonian actor, composer and violinist.

In 1980 he graduated from Tallinn State Conservatory's Performing Arts Department, and in 1992 the same institution in composition speciality. From 1980 until 1986, he played at Estonian Puppet Theatre, and from 1986 until 1992, at the Estonian Youth Theatre. Since 1993 he is a freelancer. Besides theatre roles he has played also in several films.

He has written chamber, theatre, and film music. He has been a member of music groups, e.g. in Kukerpillid (1976–1986 and 1997–1998).