The present application relates to a double blade for a surgical retractor having a base body with a substantially cylindrical mounting mandrel for mounting the double blade on a surgical retractor, and at least two blade elements that are so mounted on the base body as to be rotatable and/or displaceable through at least a certain angular range with respect to the base body. Moreover, the present application relates to a blade arrangement in which a double blade is connected to a connecting element of a further double blade, or a single blade. In this case, the at least one double blade or, optionally, the single blade is rotatable with respect to the connecting element. In addition, the application relates to a retractor with a double blade, a blade arrangement or a blade assembly comprising double blades and a blade arrangement.