| Charles Adam Karch | |
| State: | Illinois |
| District: | 22nd |
| Term Start: | March 4, 1931 |
| Term End: | November 6, 1932 |
| Predecessor: | Edward M. Irwin |
| Successor: | Edwin M. Schaefer |
| Office2: | Member of the Illinois House of Representatives |
| Term2: | 1904-1906 1910-1914 |
| Birth Date: | 17 March 1875 |
| Birth Place: | Englemann Township, Illinois, U.S. |
| Death Place: | St. Louis, Missouri, U.S. |
| Resting Place: | Mount Hope Cemetery, Belleville, Illinois, U.S. |
| Party: | Democratic |
| Alma Mater: | Northern Illinois Normal University |
Charles Adam Karch (March 17, 1875 – November 6, 1932) was a U.S. Representative from Illinois.
Born on a farm in Englemann Township, St. Clair County, Illinois, the son of German immigrants. Karch attended the public schools. He graduated from Northern Illinois Normal University (now the Illinois State University), at Normal, Illinois, in 1894. He taught school from 1895 to 1900.
Karch graduated from the law department of Wesleyan College (now Illinois Wesleyan University), Bloomington, Illinois, in 1898. He was admitted to the bar in 1898 and commenced practice in Belleville, Illinois.He served as secretary to Congressman Fred J. Kern from 1901 to 1903. He served in the Illinois House of Representatives from 1904 to 1906 and again from 1910 to 1914. He moved to East St. Louis in 1914 where he continued the practice of law. He served as United States Attorney for the eastern judicial district of Illinois 1914–1918.
Karch was elected as a Democrat to the Seventy-second Congress and served from March 4, 1931, until his death. He had been nominated for reelection to the Seventy-third Congress. He died in St. Louis, Missouri, on November 6, 1932, and was interred in Mount Hope Cemetery, Belleville, Illinois.