The purposeful studies of communities of small mammals (insectivores and rodents) on the left bank of the middle Ob within the Khanty-Mansi Autonomous Okrug – Ugra (Khanty-Mansiysk, Nefteyugansk, Surgut and Nizhnevartovsk districts) were carried out for the fi rst time from 2011 to 2020. Animal counts were carried out both in transformed and specially protected natural areas.