The Key (Russian: Ключ; tr.:Klyuch) is a 1961 Soviet feature animated film directed by Lev Atamanov. It was produced at the Soyuzmultfilm studio in Moscow.

The critic S. V. Asenin about the animated film: "The director L. Atamanov and the screenwriter M. Volpin used a fantastic form to mention (1961) burning questions of education in the animated film "Key". With original skill and a step they enclosed the new, modern contents in traditional fantastic images. What is the happiness as to reach it, what key its treasured door - this subject equally interesting to adults and children opens, they devoted the animated film."