Olivier J. LeBlanc (November 27, 1830 – December 14, 1919) was a Canadian politician of Acadian descent.

His election in 1882 was protested but he was reelected in a by-election held later that year.

Leblanc subsequently was a Minister without portfolio in the Executive Council from 1889 to 1891.

He ran unsuccessfully for a federal seat in 1891 and was then named to the Legislative Council of New Brunswick.

This article about a member of the Legislative Assembly of New Brunswick is a stub.