Joplin is an unincorporated community and census-designated place (CDP) in Liberty County, Montana, United States.

[3] Joplin was founded in 1910 by Lebanese immigrant Joseph E. Rehal, who was its first postmaster.

On September 25, 2021, at approximately 3:55 p.m., Amtrak passenger train 7/27, also known as the westbound Empire Builder, suffered a derailment 1 mile (1.6 km) west of Joplin while en route from Chicago to Seattle.

Three people were killed and 50 more were injured when the eight rear cars of the ten-car train derailed.

U.S. Route 2 runs along the southern edge of Joplin, leading west 10 miles (16 km) to Chester, the Liberty county seat, and east 50 miles (80 km) to Havre.

[6] For statistical purposes, the United States Census Bureau has defined this community as a census-designated place (CDP).