The Overland Telegraph Company was one of the organizations responsible for constructing the telegraph line which resulted in the first transcontinental telegraph network in the United States. The company built the section of line between Fort Churchill, Nevada Territory (where it connected to existing telegraph networks in California) and Salt Lake City, Utah Territory.
The first messages between California and the Utah Territory were sent via the new line on the evening of October 24, 1861, completing the transcontinental network. (The section of line between the eastern United States and Salt Lake City had been completed by the Pacific Telegraph Company a few days prior.) Soon after the line's completion, the Overland Telegraph Company was absorbed into the California State Telegraph Company, which itself became a part of the Western Union Telegraph Company in 1867.