| John P. Koehler | |
| Birth Date: | 24 February 1880 |
| Birth Place: | Norka (Krasnoarmeysky District), Saratov Oblast, Russia |
| Death Place: | West Bend, Wisconsin, U.S. |
| Player Sport1: | Football |
| Player Years2: | 1899–1901 |
| Player Team2: | Nebraska |
| Player Positions: | Center |
| Coach Sport1: | Football |
| Coach Years2: | 1903 |
| Coach Team2: | Chicago (assistant) |
| Coach Years3: | 1904–1905 |
| Coach Team3: | Lawrence |
| Coach Years4: | 1906–1910 |
| Coach Team4: | Denver |
| Coach Years5: | 1914–1915 |
| Coach Team5: | Marquette |
| Coach Sport6: | Basketball |
| Coach Years7: | 1905–1906 |
| Coach Team7: | Lawrence |
| Coach Years8: | 1906–1909 |
| Coach Team8: | Denver |
| Overall Record: | 39–29–4 (football) 15–22 (basketball) |
| Championships: | Football 1 CFA (1908) |
John Peter "Deacon" Koehler (February 24, 1880 – August 3, 1961)[1] was an American college football and college basketball coach. He served as the head football coach at Lawrence Institute in Appleton, Wisconsin—now known as Lawrence University—from 1904 to 1905, at the University of Denver from 1906 to 1910, and at Marquette University from 1914 to 1915, compiling a career college football head coaching record of 39–29–4. Koehler was also the head basketball coach at Lawrence from 1905 to 1906 and at Denver from 1906 to 1909, tallying a career college basketball head coaching record mark of 15–22.
Koehler was the health commissioner of Milwaukee from 1925 until his retirement in 1940. He died on August 3, 1961, at his home in West Bend, Wisconsin, after a heart attack.[2]