Anthony Manahan (ca 1794 – January 21, 1849) was a businessman and political figure in Upper Canada.
In 1824, he became manager of the iron works at Marmora which were then owned by Peter McGill; he returned to Kingston in 1831.
During his time in office, Manahan promoted the development of a canal along the Trent River.
Manahan was crown lands agent in the Midland and Prince Edward Districts from 1837 to 1844.
An audit found that he had made unauthorized expenditures while in the post and he was forced to sell his property to cover these costs.