<p>Here, we present ammonite localities of high scientific value from the Bathonian and Callovian strata of Northwest Bulgaria. A review of the available faunas was made, along with new illustrations and identifications of ammonites. These include abundant Perisphinctidae and Macrocephalitidae, but also accessory Oppeliidae, Morphoceratidae, Tulitidae, Stephanoceratidae and Haploceratidae. Some extreme rarities, such as Reineckeiidae, Kosmoceratidae, Parkinsoniidae and Peltoceratinae, and a limited number of Phylloceratina and Lytoceratina, also belong to the fossil assemblages. In addition, common bivalves, brachiopods and echinoids accompany the ammonites. The NW Bulgarian fossil sites are particularly valuable from the perspective of paleobiogeography and correlation since a number of distinctive ammonite taxa, as well as genera and species introduced on type material from these sites, have been found elsewhere in Europe and beyond. Besides, the localities offer the most comprehensive understanding of the phenomena they represent and have the potential for further multidisciplinary paleontological studies. Cultural, educational and geoconservation standards can be derived from them. By raising public awareness of the fossil sites from NW Bulgaria, this contribution will trigger institutional action to protect them.</p>