| William H. Gest | |
| State: | Illinois |
| Term Start: | March 4, 1887 |
| Term End: | March 3, 1891 |
| Predecessor: | William H. Neece |
| Successor: | Benjamin T. Cable |
| Birth Date: | 7 January 1838 |
| Birth Place: | Jacksonville, Illinois, U.S. |
| Death Place: | Rock Island, Illinois, U.S. |
| Party: | Republican |
William Harrison Gest (January 7, 1838 – August 9, 1912) was a U.S. Representative from Illinois.
Born in Jacksonville, Illinois, Gest moved with his parents to Rock Island in 1842.He was graduated from Williams College, Williamstown, Massachusetts, in 1860.He studied law.He was admitted to the bar in 1862 and commenced practice in Rock Island, Illinois.
Gest was elected as a Republican to the Fiftieth and Fifty-first Congresses (March 4, 1887 – March 3, 1891).He was an unsuccessful candidate for reelection in 1890 to the Fifty-second Congress.Circuit judge of the fourteenth judicial district of Illinois from June 1897 until his death in Rock Island, Illinois, August 9, 1912.He was interred in Chippiannock Cemetery.