PRISM HEART (プリズム・ハート, Purizumu Hāto) is a Japanese erotic video game developed by Pajamas Soft and was first released on October 6, 2000, and a DVD edition for Windows was released on January 25, 2008. The game was ported to the Dreamcast on November 29, 2001, with the adult content removed by KID. A fan disc entitled Prism Box went on sale on April 27, 2001.

The sequel, Prism Ark, came out on August 25, 2006. Some characters also made an appearance on the Prism Ark anime.