Nonhuman is a derogative hypernym used to refer to all other sentient, civilized humanoid races besides humans. Although there are few people without some sort of elven blood in the world of The Witcher, some races are still considered to be "non-human". These include:
This might also include vrans, as well as others, but I am not 100% sure...
In The Witcher computer game
In the game, relations seem to be at an all-time low between humans and non-humans. The essence of the conflict in the game is interracial relations. The Order of the Flaming Rose purports to stand for and defend humans, while the Scoia'tael are a non-human, guerilla movement fighting for the betterment of their kind in a world run by humans.