| Adolph Sieberts | |
| Width: | 180px |
| Position: | Forward |
| Birth Date: | 29 August 1893 |
| Birth Place: | Portland, Oregon, U.S. |
| Death Place: | Portland, Oregon, U.S. |
| College: | Oregon State (1913–1917) |
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Adolph G. "Ade" Sieberts (August 29, 1893 – April 28, 1968)[1] was an American basketball player, most notable for a college career distinguished by his becoming Oregon State University's first All-American in the sport.[2]
Sieberts, a forward from Portland, Oregon, went to Oregon Agricultural College (now Oregon State University) where he played basketball and baseball. As a basketball player, he led the Aggies to a Pacific Coast Conference (now known as the Pac-12 Conference) championship and was named first-team all-conference. He was also named an All-American by the Helms Athletic Foundation for his 1915–16 junior season.[2]
Sieberts quit the Aggies' basketball team during his senior season to enter the business world.[3] Despite this he was named to the PCC all-conference team for the second consecutive season.[2]