| Royall Tyler Moore | |
| Birth Date: | October 11, 1930 |
| Birth Place: | Varna, New York, U.S. |
| Fields: | Mycology |
| Alma Mater: | Michigan State College Harvard University |
| Doctoral Advisor: | Ivan Mackenzie Lamb |
| Known For: | New species Fungal diversity and development |
| Author Abbrev Bot: | R.T. Moore |
| Awards: | Benefactor's Medal, British Mycological Society Doctor of Science |
Royall Tyler Moore (October 11, 1930 – August 17, 2014) was an American-born mycologist and mycology professor.
He received his doctorate from the Harvard University in 1959, writing his dissertation on the fungal genus Sporidesmium. Later, he worked at Cornell University, the University of California, Berkeley, and North Carolina State University on the classification and development of fungi before joining the faculty at Ulster University at Coleraine. Moore bequeathed almost $500,000 to Cornell University to promote the study of mycology.