Krishnan Thoothu is a 1940 Tamil language film produced by S. M. Letchumanan Chettiyar and Rajagopal Talkies. Directed by R. Prakash, the film marked the debut of Telugu actress P. Kannamba in the Tamil film industry.
The movie's plot revolves around Lord Krishna assisting the Pandavas against King Duryodhana from the Kaurava clan. Serukulathur Sama plays the main role of Lord Krishna, while P. Kannamba makes her debut as the heroine. A short comedy film titled 'Kozhukattai Kuppu' was shown alongside it.
The songs in the film were recorded by Jyotish Sinha, with lyrics penned by Papanasam Sivan and Rajagopala Iyer.