P.J. Proby (born James Marcus Smith, November 6, 1938) is an American singer, songwriter, and actor, who has portrayed Elvis Presley and Roy Orbison in musical theater productions as well as enjoying a successful recording career in his own right.

The stage name P.J. Proby was suggested to him by his friend Sharon Sheeley who had had a boyfriend of the same name at high school. In 2008, Proby celebrated his 70th birthday and EMI released the Best Of The EMI Years 1961-1972.