Mon Colle Knights, known as Rokumon Tengai Mon Colle Knight (六門天外モンコレナイト, Rokumon Tengai Mon Kore Naito; Six Gate Far Away Mon Colle Knights?) in Japan, is an anime and manga series. The original concept was made by Hitoshi Yasuda and Group SNE. The series is based on Monster Collection trading card game.

The Japanese version aired on TV Tokyo, consisting out of 51 episodes and with 1 movie made for the series. The Saban-produced Mon Colle Knights aired on Fox Kids in North America from July 2001 to September 2002, consisting out of 45 episodes. In 2006 it aired on Jetix on Sundays September 10 at 10:00pm. The manga, written by Satoru Akahori and Katsumi Hasegawa and drawn by Hideaki Nishikawa, is published in English in Singapore by Chuang Yi.

The series features Mondo Ooya and his (girl)friend Rockna Hiiragi, whose father invented a way to travel to Mon World (Roku Mon Sekai, the Six Gate World), where all sorts of magical creatures live. Together, they try to find six monster items which, when combined, could merge the Six Gate World with planet Earth for the better of both worlds. Rockna and Mondo form the Mon Colle Knights, and when chanting a phrase they can merge into monsters and control them into battle as well as aid with spells. Almost every episode, they battle Prince Eccentro (Count Collection in the Japanese version) and his two lackeys who are after the same thing as the Mon Colle Knights, except that they intend to use the items to dominate both worlds.