Mountain Press Publishing Company is an American book publishing company based in Missoula, Montana. It specializes in western U.S. history, natural history, and non-technical earth science, geology, and ecology.

The company began in 1948 when David P. Flaccus started an offset printing business in Missoula. Over several years the company evolved into an independent publishing company and eventually a distributor for other publishers. The company's largest and most popular series of books is Roadside Geology with 29 titles and sales of over 1 million total copies. Other popular series include Geology Underfoot (7 titles) and Roadside History (18 titles).