A process for producing a desulfurized gasoline boiling range product of relatively high octane number from a sulfur containing feed boiling in the naphtha boiling range by converting the feed in a single stage over a catalyst which comprises a) a substantially acidic porous refractory solid having an intermediate effective pore size and the topology of a zeolitic behaving material, which, in the aluminosilicate form, has a Constraint Index of about 1 to 12, e.g., MCM-22, b) a Group VI metal, e.g., Mo, c) a Group VIII metal, e.g., Co, and d) a suitable refractory support, e.g., Al.sub.2 O.sub.3, under hydrotreating conditions to produce a product comprising a normally liquid fraction boiling in substantially the same boiling range as the feed, but which has a lower sulfur content than the feed and which has an octane number substantially no less than the feed.