Krishnan Thoothu also known as Sri Krishnan Thoothu was a 1940 Tamil-language film directed by R. Prakashm and produced by S. M. Letchumanan Chettiyar and Rajagopal Talkies. It was known for being the debut Tamil film of Telugu actress P. Kannamba.A short comedy film titled Kozhukattai Kuppu was also screened along with the main film.