Prosthetic heart valves including a radiopaque marker configured to indicate a location of a commissure of the prosthetic heart valve are disclosed. As one example, a prosthetic heart valve includes an annular frame comprising a plurality of struts, a plurality of leaflets arranged within the frame, and at least one commissure comprising commissure tabs of two adjacent leaflets of the plurality of leaflets connected to each other, the at least one commissure coupled to the frame. The valve further includes a radiopaque marker, separate from the frame, attached to the commissure, where the marker is configured to indicate a location of the commissure of the prosthetic heart valve.