Hamulina is an extinct ammonoid cephalopod genus belonging to the family Hamulinidae.

The short final shaft is generally straight or curved.

The main shaft is with dense, fine, prorsiradiate minor ribs and distant, periodic, weakly trituberculate major ribs.

The minor ribs are weakened or disappearing on hook and final shaft.

Fossils of these cephalopods have been found in rocks of Cretaceous of Bulgaria, Colombia (Santa Rosa de Viterbo, Boyacá), Hungary, Italy, Mexico, Spain, Trinidad and Tobago.