An osteotomy marker (1) comprised of an interchangeable head (3) connected to a guide wire (2), so that the guide wire (2) is fixed to a surgical hand piece (15) and the interchangeable head (3) establishes a predetermined distance (D) with respect to a reference point at which that interchangeable head (3) guides a cutting tool (16) that performs the osteotomy； the interchangeable head (3) is formed by a central body (9) to which are joined a connector (5) and a support element (11) with a main body (28) that has two flat sides (29a, 29b) parallel to each other, establishing the predetermined distance (D) between the first flat side (29a) and a groove (10) in the central body (9), with the support element (11) resting on the first flat side (29a) at the reference point and the groove (10) marking the position and the predetermined distance (D) for performing the osteotomy.
