| Frederick Preston Rubidge | |
| Nationality: | Canadian |
| Birth Date: | 10 March 1806 |
| Birth Place: | London, England |
| Death Date: | 16 August 1897 |
| Death Place: | Montreal, Quebec |
| Practice: | 1831-1872 |
| Significant Buildings: | Rideau Hall, Rideau Cottage |
Frederick Preston Rubidge, (10 March 1806 - 16 August 1897), was a surveyor and an architect. He was born in England and emigrated to Upper Canada around 1825 where he took his training.
Rubidge first qualified as a provincial surveyor in 1831 and completed important surveys over the next few years. In 1841, the Board of Works of the Province of Canada (Public Works after 1846) was formed and he was among the initial employees. Much of his work involved design for public buildings. He held the title of assistant engineer but became known as architect for the department. He had various roles associated with the parliament and department buildings in Ottawa. One of the more intriguing projects concerned Rideau Hall, the former home of Thomas McKay, and its conversion to the official residence of the governor general of Canada.
Rubidge was retired in 1872 at the age of sixty five. This unhappy event ended his public career and died in Montreal in 1897.