| Robert L. Joynt | |
| Office1: | Ontario MPP |
| Term Start1: | 1898 |
| Term End1: | 1904 |
| Predecessor1: | Orlando Bush |
| Successor1: | Howard Ferguson |
| Constituency1: | Grenville |
| Party: | Conservative |
| Birth Date: | 22 May 1845 |
| Birth Place: | New Boyne, Leeds County, Canada West |
| Death Place: | Elizabethtown, Ontario |
| Occupation: | Merchant |
Robert L. Joynt (May 22, 1845 - November 4, 1931) was an Ontario merchant and political figure. He represented Grenville in the Legislative Assembly of Ontario from 1898 to 1904 as a Conservative member.
He was born in New Boyne, Leeds County, Canada West, to Irish immigrants. Joynt was the reeve for Augusta Township from 1891 to 1895 and warden for the United Counties of Leeds and Grenville in 1895. He married Margaret Donovan in 1874. He died in 1931.[1]