| Alexander Peter Ross | |
| Office1: | Ontario MPP |
| Term Start1: | 1883 |
| Term End1: | 1886 |
| Predecessor1: | William Mack |
| Successor1: | Riding abolished |
| Constituency1: | Cornwall |
| Party: | Conservative |
| Birth Date: | 19 December 1831 |
| Birth Place: | Cornwall Township, Upper Canada |
| Death Place: | Cornwall, Ontario |
| Occupation: | Lumber merchant |
Alexander Peter Ross (December 19, 1831 – October 18, 1915) was a politician in Ontario, Canada. He was a Conservative member of the Legislative Assembly of Ontario from 1883 to 1886 who represented the eastern riding of Cornwall.
He was born in Cornwall Township, Upper Canada in 1833. Ross was a lumber merchant and building contractor. He served on the town council and was mayor of Cornwall. He died in Cornwall in 1915.[1]