Intraspecific predation or cannibalism in Brown Bears (Ursus arctos) is becoming increasingly reported in the literature. Cases of infanticidal behaviour and killing of juvenile individuals by adult males are most common, while adult-on-adult predation is rare. We report three cases of intraspecific predation or cannibalism in Bulgaria, spanning a period from 2000 to 2021. The first case (2000) involved the likely killing and partial consumption of an adult female by an adult male individual at a supplementary feeding site for game. The second (2020) was a case of infanticide where a male was directly observed consuming the carcass of a cub of the year (COY). The third (2021) was confirmed through the identification of juvenile bear body parts (claw, fur) in an adult bear’s excrement. These observations contribute to the understanding of intraspecific aggression in brown bears and highlight the importance of monitoring such behaviours in relation to food availability, population density and other environmental and behavioural variables.