The invention provides for a diffuser (1) for a wind turbine (2). The diffuser (1) comprises an inner diffuser element (8) including a number of vanes (4, 5, 6), wherein at least a first vane (4) and a second vane (5) is arranged in continuation of each other. At least the first vane (4) and the second vane (5) are angled in relation to each other to form a curved cross sectional diffuser profile (7) and a free space (10) is arranged between the neighbouring first vane (4) and second vane (5) to enable air flow between the first vane (4) and second vane (5). The diffuser (1) further comprises at least one further diffuser element (9), wherein at least a first further diffuser element (9) of the at least one further diffuser element (9) is arranged in a further element distance (ED) from the inner diffuser element (8) on an outside (13) of the inner diffuser element (8) in radial direction, so that the further diffuser element (9) substantially encircles the inner diffuser element (8) and so that an open flow-
