An engine mounting for suspending an engine relative to a vehicle structure. The engine mounting comprises a first armature for connection to the engine and a second armature for connection to the vehicle structure and a bellows (12) interposed between the first and second armatures to define therewith a closed enclosure. The closed enclosure is filled with pressurized gas. An inertia mass (34) is mounted on the bellows. A mass of the inertia mass and an apparent spring constant of the bellows are selected such that the inertia mass vibrates in inverse phase relastionship with the phase of vibration of the first armature when the engine operates within a vibration insulated domain. The engine mounting comprises partition plates (50, 52) within the bellows to divide the interior of the bellows into two chambers which are communicated with each other through passage means. The passage means are variable in its effective area depending upon the amplitudes of vibrations of the bellows. The effective area of the passage means is decreased during vibrations of the bellows with large amplitudes, while, the effective area of the passage means is decreased during vibrations of the bellows with small amplitudes.