Reigan-ji (霊巌寺), is a Buddhist temple located in Kōtō-ku, Tokyo, Japan.

The temple belongs to the Jōdo-shū sect of Japanese Buddhism and its honzon is a statue of Amida Nyōrai The temple was established in 1624 in Reiganjima, a reclaimed marshland near Nihonbashi by Reigan Shōnin (1554-1641).

Reigan Shōnin was the son of a retainer of the Imagawa clan who became a priest at the age of 11.

In 1658, the temple was rebuilt, but at its present location as part of the Tokugawa shogunate's urban remodeling plan for Edo.

The grave of rōjū Matsudaira Sadanobu, daimyō of Shirakawa and senior councillor to Shogun Tokugawa Ienari and author of the Kansei Reforms is located at Reigan-ji.