This paper investigates the impact of outsourcing on wage settlement in the public sector. The study characterizes the equilibrium wage offered by the public sector union to a government bureau competing against private sectorfirms. It is predicted that the union will offer a concession wage in an attempt to block outsourcing when i~ members' outside employment options are sufficiently unattractive and will offer a non-concession wage otherwise. The study contributes to the literature on outsourcing and wage determination in the public sector. (JEL J~5, J51, HO)