An adapter (6) for mounting a loader (1) to the rear linkage (4,5) of a tractor (2). The adapter comprises a body portion (66) provided with first horizontally spaced attachment means (63,63) for connection with implement attachment means provided on the outer ends of the lower links and a pair of vertically extending spaced attachment plates (61,61) carried by the body portion. The attachment plates have second attachment means (62) for engagement with complementary attachment means provided on the inner ends of the loader arms (210,210) to attach the loader (1) to the adapter (6).