A device for separating oil from a gas is provided which includes a housing forming a peripheral wall with an inlet at a top end of the housing for receiving an oil/gas mixture, a gas outlet formed by a conduit extending through the top end of the housing and an oil outlet at a bottom end of the housing. Within the housing there is a helical wall extending between the gas outlet conduit and the peripheral wall to cause the oil/gas mixture to flow in a largely circumferential path along the peripheral wall. Between the helical wall and the peripheral wall there is provided a mesh screen for collecting and separating the oil from the oil/gas mixture. The collected oil drips from the screen to a baffle with apertures therein which directs the oil therethrough for receipt in an oil collection zone below the baffle. The gas outlet conduit has an opening above the baffle for permitting relatively oil-free gas to exit the oil separator.