Kamtschatarctos is an extinct genus of pinniped that lived approximately 15.97 to 11.608 mya during the Early Miocene in the Kavran-Ukhtolok Bay of Russia's Kamchatka Peninsula.

[1][2][3] It belonged to the family Odobenidae, the only extant species of which is the walrus.

[4] Kamtschatarctos sinelnikovae is known from a partially complete skeleton, discovered in the Etolon Formation in Russia.

Kamtschatarctos is a relatively basal species of odobenid.