Abstract: A circular knitting machine for hosiery or the like, with a device for actuating the knockover sinkers, comprising a sinker cover, arranged in an upward region and coaxially to the sinker ring and supporting at least one cam and one complementary cam arranged outside the cam with respect to the cylinder axis, the cam and the complementary cam forming path portions running around the cylinder axis engageable by a heel of the knockover sinkers to actuate movement thereof along a radial direction, a first actuation varying angular position of the sinker cover, and a second actuation varying movement of the complementary cam.