| Robert Austin Shearer | |
| Office1: | Ontario MPP |
| Term Start1: | 1914 |
| Term End1: | 1919 |
| Predecessor1: | John Colborne Milligan |
| Successor1: | James William McLeod |
| Constituency1: | Stormont |
| Party: | Conservative |
| Birth Date: | 16 March 1868 |
| Birth Place: | Cornwall Township, Ontario |
| Death Place: | Cornwall, Ontario |
| Occupation: | Farmer |
Robert Austin Shearer (March 16, 1868 - December 3, 1920) was an Ontario farmer and political figure. He represented Stormont in the Legislative Assembly of Ontario from 1914 to 1919 as a Conservative member.
He was born in Cornwall Township, Ontario, the son of James A. Shearer. In 1888, he married May Robertson. Shearer served as deputy sheriff. For a time, he was involved in the production of aerated water. He died in Cornwall.