Rolla () is a city in and the county seat of Phelps County, Missouri, United States. The population in the 2010 United States Census was 19,559. Rolla is located approximately midway between St. Louis and Springfield along I-44. The Rolla, Mo Micropolitan Statistical area consists of Phelps County, Missouri.
It is the home of the Missouri University of Science and Technology, well known, both nationally and internationally, for its many engineering departments and computer science department.
The headquarters of the Mark Twain National Forest is located in Rolla. The city is also within the Ozark Highlands American Viticultural Area, with vineyards established first by Italian immigrants to the area.
The first European-American settlers in Phelps County arrived in the early 19th century, working as farmers and iron workers along the local rivers, such as the Meramec, the Gasconade, and the Little Piney. In 1844, John Webber built the first house in what became the City of Rolla.