A hydraulically damped mounting device has two anchor parts connected by deformable wall. A partition is associated with one of the anchor parts and defines, together with the deformable wall a working chamber for hydraulic fluid. The working chamber is connected via a passageway to a compensation chamber partially bounded by another deformable wall. The partition separates the working and compensation chambers, and the device has a diaphragm being a barrier between the hydraulic fluid and a gas. In one arrangement at least part of the passageway is formed within a cavity in the partition in which there are projections which are arranged to overlap, and so define a convoluted path for the hydraulic fluid around the projections. In another arrangement a duct to a diaphragm part is at least partially formed by a cavity within the partition, which cavity has cylindrical projections arranged one within the other and overlapping to form a convoluted path for hydraulic fluid. In a third arrangement the passageway has a branch to the diaphragm, which branch is convoluted as it passages through a cavity in the partition containing cylindrical projections.