Cornish is an unincorporated community in Weld County, in the U.S. state of Colorado.
A post office called Cornish was established in 1914, and remained in operation until 1967. The community was named after a Mr. Cornish, an engineer employed by the Union Pacific Railroad.
A railway was built through Cornish sometime in the early 1900s, as part of a line from Greeley to Briggsdale. The Union Pacific Railroad filed for the abandonment of the line in 1942, with the actual abandonment occurring in 1946.