NGC 3940 is an elliptical galaxy, located 300 million light-years away in the Leo constellation. It was discovered on April 26, 1785, by astronomer William Herschel. NGC 3940 is a member of the NGC 3937 Group.
NGC 3940 has a supermassive black hole with an estimated mass of 5 à10<sup>8</sup> <var>M</var><sub>âÂÂ</sub>.