Sergio Uñac (born 15 February 1970) is an Argentine politician who serves as governor of the San Juan Province.

He is the son of the former mayor of Pocito Joaquín Uñac and he is of Lebanese descent by his mother side.

When Gioja was hospitalised following a plane crash, Uñac became the new interim governor on October 11, 2013.

He led the state funeral for deputy Margarita Ferrá de Bartol, who died in the plane crash, and asked the population to stay calm and continue working as usual, despite the unprecedented event in the province.

He negotiated with Barrick Gold in November, to prevent the corporation from leaving its operations in San Juan.