Moon Hee-jun 문희준 (born 14 March 1978, Seoul) is a South Korean musician formerly of the group H.O.T. His debut album was "Alone". The music and the words of all the tracks in the album, except for "이별이 아님을" which was an adaptation of "Auld Lang Syne," were written by Moon, making this album a showcase of his many talents. He also created PS Entertainment after leaving SM Entertainment.

Before H.O.T. was disband in 2001, there were many detractors of Moon. It appeared that some overacting fanatics of H.O.T. made other people uncomfortable with the group. This became a significant social phenomenon in South Korea after Moon became a solo rock artist; uncountable parody pictures, texts, and musics of him flooded over the internet. Feeling that these were unfair insults, Moon once appealed for people to stop this in a newspaper interview, and the article about it on the web recorded more than 320,000 comments because of his detractors swarming on it, called 성지순례; literally means 'pilgrimage'.

In 2008, Moon Hee Jun returned from military duties, and in March 2008, he released his single "Obsession".

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