Premier Doug Ford has called a pair of Ottawa by-elections for Feb. 27.
The Ottawa-Vanier seat has been vacant since the summer, when Liberal Nathalie Des Rosiers resigned, and Liberal Marie-France Lalonde left Orleans in October to represent the riding federally.
The Liberals will run Stephen Blais in Orleans and Lucille Collard in Ottawa-Vanier.
The governing Progressive Conservatives have named Natalie Montgomery and Patrick Mayangi as their candidates in Orleans and Ottawa-Vanier.
For the New Democrats, Manon Parrot is running in Orleans and Myriam Djilane is running in Ottawa-Vanier.
Both ridings have long been held by the Liberals.
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