Vilaiyattu Pillai (transl. Playful boy) is a 1970 Indian Tamil-language film, directed by A. P. Nagarajan and produced by Gemini Studios. It is based on Kothamangalam Subbu's novel Rao Bahadur Singaram, which was serialised in the magazine Ananda Vikatan. The film stars Sivaji Ganesan, Padmini and Kanchana. It deals with the romance between a woman who raises a bull and a man who sets out to tame it.

Vilaiyattu Pillai was released on 20 February 1970. The film was a commercial success, running for over 100 days in theatres.