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.