Abstract: A device for fixing a fuel injector (12) in an internal combustion engine cylinder head (1) whereon is set a camshaft bracket (4) top surface delimiting with this surface a chamber (8) containing valve-actuating mechanical members. The injector (12) passes through the camshaft bracket (4) and the cylinder head (1) supported on the base (18) of a recess (14) in the cylinder head by a fork (20) fixed by a screw (26) to the cylinder head (1). The fork (20) is arranged in the chamber (8) under a camshaft (6) extending perpendicular to said shaft (6) and comprises two branches (20a, 20b) which are supported on either side of the injector body (12), in useful fixing position, on two wings (21, 22) symmetrically arranged on the injector (12) body periphery.