| Bill Lowenthal | |
| Birth Date: | 23 September 1909 |
| Originalteam: | Ascot Vale Presbyterians |
| Height: | 173 cm |
| Weight: | 70 kg |
| Statsend: | 1937 |
| Years1: | 1930–1937 |
| Club1: | Essendon |
| Games Goals1: | 73 (14) |
| Years2: | 1937 |
| Club2: | Fitzroy |
| Games Goals2: | 13 (1) |
| Games Goalstotal: | 86 (15) |
William Lowenthal (23 September 1909 – 13 July 1989)[1] was an Australian rules footballer who played with Essendon and Fitzroy in the Victorian Football League (VFL) during the 1930s.[2]
Although a centreman originally, Lowenthal developed into a half back flanker where he was a strong mark overhead and had plenty of dash. It was in that position that he was runner up at the 1933 Brownlow Medal count by just one vote to Wilfred "Chicken" Smallhorn. He was unlucky as he had missed three games late in the season due to an ankle injury. In 1933 Lowenthal also represented Victoria at the Sydney Carnival.
Lowenthal crossed to Fitzroy in 1937 and at the end of the season joined Victorian Football Association (VFA) club Preston. He was with Preston for four seasons and from 1942 to 1946 represented the RAAF team, often as captain.