| Robert Desty | |
| State Senate: | California |
| District: | 8th |
| Term: | Not seated |
| Successor: | James D. Byrnes |
| Birth Name: | Robert d'Aillebout d'Estimauville de Beaumouchel |
| Birth Date: | 17 February 1827 |
| Birth Place: | Quebec, Canada |
| Death Place: | Rochester, New York, U.S. |
| Occupation: | Lawyer, jurist |
| Children: | 1 |
| Allegiance: |  United States |
| Serviceyears: | 1847 |
| Rank: | Sergeant |
| Battles: | Mexican–American War |
Robert Desty was a Canadian-American lawyer and politician. He was elected to the California State Senate in 1879, but was denied his seat on the grounds that he was not a naturalized citizen.[1] He served in the United States Army during the Mexican–American War.[2]