Hat Creek (Achumawi: Hatiwïwi)[4] is a 48.7-mile-long (78.4 km)[5] stream and tributary of the Pit River, which is located in Shasta County of northern California.

[7] The lower three and a half miles of the creek has been designated by the California Department of Fish and Game as a "Wild Trout Waterway," with restrictive catch limits.

During the May 19, 1915, eruption of Mount Lassen, a lahar swept down Hat Creek.

[8][9] There is a small mountain in Lassen National Park where the stream starts.

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