Klonoa: Door to Phantomile is a video game developed and published in 1997 by Namco for the Sony PlayStation video game console. The game's story focuses on an anthropomorphic creature and a "spirit" encapsulated in a ring.

The game was critically praised, and sales in Japan reached fourth in the weekly charts. Sales in the United States, Canada and the PAL region were low. An original game, Door to Phantomile was followed by Klonoa 2: Lunatea's Veil and five related games. A remake of the game was released for the Wii in Japan on December 4, 2008.