| William M. Sinton | |
| Birth Date: | April 11, 1925 |
| Birth Place: | Baltimore, US |
| Death Date: | March 16, 2004 |
| Death Place: | Flagstaff, Arizona, US |
| Fields: | Infrared astronomy |
| Work Institution: | Harvard College Observatory Smithsonian Astrophysical Observatory Lowell Observatory University of Hawaii |
| Alma Mater: | Johns Hopkins University |
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| Known For: | Spectroscopic studies of Mars that appeared to support the existence of plants on Mars |
| Spouse: | Marjorie Korner |
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William Merz Sinton (April 11, 1925 – March 16, 2004)[1] was a Harvard astronomer whose 1950s studies seemed to support the existence of Martian vegetation.[2] A crater on Mars is named after him. He received many awards and recognitions, including the 1954 Adolph Lomb Medal from OSA. He was also elected an OSA Fellow in 1961. During his lifetime, he published over 100 scientific papers and two books.[3]