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Three cases of concrescence of the fourth premolar with the first molar and one case of concrescence of the third and the fourth premolars are described in the Pacific walrus, Odobenus rosmarus divergens (Illiger, 1815). These cases represent 0.3% of the total number of inspected teeth (n = 1206) from 307 animals. All individuals (n = 3) were adult males aged 22–26 years old. The beginning of concrescence was found in animals ranging from 7 to 23 years old. The sections of concrescent teeth showed them to be joined by newly deposited layers of cementum. How to cite this article: Kryukova N.V. 2017. Cases of teeth concrescence in the Pacific walrus (Odobenus rosmarus divergens) // Russian J. Theriol. Vol.16. No.1. P.110–113. doi: 10.15298/rusjtheriol.16.1.10