| Lew Riess | |
| Birth Date: | 19 October 1887 |
| Birth Place: | Philadelphia, Pennsylvania, U.S. |
| Death Place: | Antwerp, Belgium |
| Alma Mater: | Swarthmore College |
| Coach Sport1: | Football |
| Coach Years2: | 1908–1909 |
| Coach Team2: | Hampden–Sydney |
| Coach Years3: | 1911 |
| Coach Team3: | VPI |
| Coach Years4: | 1912—1917 |
| Coach Team4: | Randolph–Macon |
| Coach Sport5: | Basketball |
| Coach Years6: | 1908–1912 |
| Coach Team6: | Hampden–Sydney |
| Coach Sport7: | Baseball |
| Coach Years8: | 1912 |
| Coach Team8: | VPI |
| Admin Years1: | 1910 |
| Admin Team1: | VPI |
| Admin Years2: | c. 1915 |
| Admin Team2: | Randolph–Macon |
| Overall Record: | 33–39–4 (football) 3–6 (basketball) 9–9 (baseball) |
| Championships: | Football 2 EVIAA (1908, 1912) |
Lewis William Riess (October 19, 1887 – January 4, 1946) was an American football, basketball, and baseball coach and college athletics administrator. He served as the head football coach at Hampden–Sydney College from 1908 to 1910 and at Virginia Agricultural and Mechanical College and Polytechnic Institute (VPI) — now known as Virginia Tech — in 1911, and Randolph–Macon College from 1912 to 1917, compiling a career college football record of 33–39–4. Riess was also the head basketball coach at Hampden–Sydney from 1908 to 1912, amassing a record of 3–6, and the head baseball coach at VPI in 1912, tallying a mark of 9–9.
Riess left Randolph–Macon in December 1917 to become the athletic director of a United States Army aviation camp in Jacksonville, Florida.[1] He served as the activity secretary of the Army-Navy YMCA in Honolulu from 1938 to 1941. He died on January 4, 1946, in Belgium.[2]