A closure for an orthosis, having a belt assembly, having a first closure part and a second closure part, which can be releasably connected to one another, wherein the first and the second closure parts (1, 21) have connecting means (5, 27, 29, 31, 47) for belts of the belt assembly, wherein the first closure part has a pin, wherein the second closure part has a connection end, on which the connecting means (27, 29, 31) is formed, and has a coupling end, and between the connection end and the coupling end a guide track extending in a closure plane is provided, which extends from an entrance opening to a guide track end, and which is designed to receive the pin and guide it between the entrance opening and the guide track end along the guide track, wherein the guide track is designed such that any possible movement of the pin out of its position in the guide track end either runs perpendicular to a connecting line between the connection end and the coupling end, or the projection of this movement is directed on the connecting line toward the connection end, wherein the pin has a first section near to the connecting means of the first closure part and a second section adjoining the first section and disposed on the end of the first section opposite the connecting means, wherein the dimension of the first section perpendicular to the direction of extension of the pin corresponds to the dimension of the guide track in the closure plane at the guide track end, wherein the dimensions of the second section perpendicular to the direction of extension of the pin are greater than the dimension of the guide track at the guide track end, so that the second section restricts a movement of the pin relative to the second closure part perpendicular to the closure plane, wherein the guide track extends to the edge of the second closure part, wherein the entrance opening is formed in the edge of the second closure part, and wherein the entrance opening is provided between the connection end and the coupling end on a first side of the connecting line between the connection end and the coupling end, characterized in that the second closure part has another connecting means for another belt of the belt assembly, and wherein the other connecting means is provided on a second side of the connecting line opposite the first side. having a first closure part and a second closure part, which can be releasably connected to one another, wherein the first and the second closure parts (1, 21) have connecting means (5, 27, 29, 31, 47) for belts of the belt assembly, wherein the first closure part has a pin, wherein the second closure part has a connection end, on which the connecting means (27, 29, 31) is formed, and has a coupling end, and between the connection end and the coupling end a guide track extending in a closure plane is provided, which extends from an entrance opening to a guide track end, and which is designed to receive the pin and guide it between the entrance opening and the guide track end along the guide track, wherein the guide track is designed such that any possible movement of the pin out of its position in the guide track end either runs perpendicular to a connecting line between the connection end and the coupling end, or the projection of this movement is directed on the connecting line toward the connection end, wherein the pin has a first section near to the connecting means of the first closure part and a second section adjoining the first section and disposed on the end of the first section opposite the connecting means, wherein the dimension of the first section perpendicular to the direction of extension of the pin corresponds to the dimension of the guide track in the closure plane at the guide track end, wherein the dimensions of the second section perpendicular to the direction of extension of the pin are greater than the dimension of the guide track at the guide track end, so that the second section restricts a movement of the pin relative to the second closure part perpendicular to the closure plane, wherein the guide track extends to the edge of the second closure part, wherein the entrance opening is formed in the edge of the second closure part, and wherein the entrance opening is provided between the connection end and the coupling end on a first side of the connecting line between the connection end and the coupling end, characterized in that the second closure part has another connecting means for another belt of the belt assembly, and wherein the other connecting means is provided on a second side of the connecting line opposite the first side.