This invention relates to an internal combustion engine with intake and exhaust valves (6, 7) and one nozzle mount (4) per cylinder (2) for an injection nozzle (5) injecting fuel into a combustion chamber, the nozzle mount being connected to a fuel supply line (14) and a return oil line (19), the nozzle mount (1) being screwed into a first recess (13) in the cylinder head (1), and the cylinder head (1) exhibiting a second recess (17) approximately normal to an engine longitudinal plane (16) containing the cylinder axis (3), which second recess, extending from a first cylinder head longitudinal side wall (15a), intersects the first recess (13) approximately radially. In order to make possible a reliable fuel supply to the nozzle mount (4) with minimal space requirement and short fuel supply lines (14), the second recess (17) continues up to the second cylinder head longitudinal side wall (15b) lying opposite the first cylinder head longitudinal side wall (15a) and forms in this region the return oil drain.