Monongah is a town in Marion County, West Virginia, United States, situated where Booths Creek flows into the West Fork River. The population was 972 at the 2020 census. Monongah was chartered in 1891, based on Chapter 47 of West Virginia code. Its name is derived from the nearby Monongahela River.

The Monongah mining disaster of Monongah, West Virginia occurred on December 6, 1907, and has been described as "the worst mining disaster in American history". The explosion occurred in Fairmont Coal Company’s No. 6 and No. 8 mines, and was one of the contributing events leading to the creation of the United States Bureau of Mines.