Ratnakumar is a 1949 Indian Tamil-language film starring P. U. Chinnappa and P. Bhanumathi.

At the bidding of the hero, a skeleton hurls a giant rock on the ground, and diamonds, rubies and emeralds pop out.

Falling into evil company, he becomes addicted to vices that make him ill-treat his wife and then desert her without any qualms.

Rathnakumar is an ordinary man of shifting loyalties, greed, lust, deceit and ultimately penitence.

C. R. Subburaman made K. Malathi to sing a solo and a duet with PUC in this film.