A compensating chuck (1, 101, 201) for concentrically clamping workpieces, comprising - a housing (3, 103, 203), - two pairs of mutually diametrally opposed main jaws (9a, d; 9b, 9c; 109a, d; 109b, c; 209a, d; 209b, c) for receiving corresponding clamping jaws, and - a transmission for preferably radially moving the main jaws (9a-d, 109a-d, 209a-d) towards and away from each other, wherein the transmission has a drive unit (11, 111, 211) having two pairs of drivable entrainment members (37a, d; 37b, c; 137a, d; 137b, c; 237a, d; 237b, c), wherein the entrainment members - are mounted movably, preferably slidingly, in the housing (3, 103, 203), characterised in that the entrainment members are respectively movable towards and away from each other in paired relationship (37a, d; 37b, c; 137a, d; 137b, c; 237a, d; 237b, c), and - are coupled to a respective one of the main jaws (9, 109, 209) and the drive unit and the main jaws are so configured that a relative movement of the entrainment members (37a, d; 37b, c; 137a, d; 137b, c; 237a, d; 237b, c), of a respective pair with the same movement components relative to each other causes a synchronous movement of adjacent main jaws (9a, d; 9b, 9c; 109a, d; 109b, c; 209a, d; 209b, c) and that both a relative movement of the entrainment members (37a, d; 37b, c; 137a, d; 137b, c; 237a, d; 237b, c) relative to each other with respectively different movement components and also a synchronous movement of the adjacent entrainment members (37a, d; 37b, c; 137a, d; 137b, c; 237a, d; 237b, c) in the same direction respectively causes a relative movement of adjacent main jaws (9a, d; 9b, 9c; 109a, d; 109b, c; 209a, d; 209b, c) relative to each other. - a housing (3, 103, 203), - two pairs of mutually diametrally opposed main jaws (9a, d; 9b, 9c; 109a, d; 109b, c; 209a, d; 209b, c) for receiving corresponding clamping jaws, and - a transmission for preferably radially moving the main jaws (9a-d, 109a-d, 209a-d) towards and away from each other, wherein the transmission has a drive unit (11, 111, 211) having two pairs of drivable entrainment members (37a, d; 37b, c; 137a, d; 137b, c; 237a, d; 237b, c), wherein the entrainment members - are mounted movably, preferably slidingly, in the housing (3, 103, 203), characterised in that the entrainment members are respectively movable towards and away from each other in paired relationship (37a, d; 37b, c; 137a, d; 137b, c; 237a, d; 237b, c), and - are coupled to a respective one of the main jaws (9, 109, 209) and the drive unit and the main jaws are so configured that a relative movement of the entrainment members (37a, d; 37b, c; 137a, d; 137b, c; 237a, d; 237b, c), of a respective pair with the same movement components relative to each other causes a synchronous movement of adjacent main jaws (9a, d; 9b, 9c; 109a, d; 109b, c; 209a, d; 209b, c) and that both a relative movement of the entrainment members (37a, d; 37b, c; 137a, d; 137b, c; 237a, d; 237b, c) relative to each other with respectively different movement components and also a synchronous movement of the adjacent entrainment members (37a, d; 37b, c; 137a, d; 137b, c; 237a, d; 237b, c) in the same direction respectively causes a relative movement of adjacent main jaws (9a, d; 9b, 9c; 109a, d; 109b, c; 209a, d; 209b, c) relative to each other.