Tatjana Višak, often credited as Tatjana Visak, is a German philosopher specialising in ethics and political philosophy who is currently based in the Department of Philosophy and Business Ethics at the University of Mannheim. She is the author of the monographs Killing Happy Animals and Capacity for Welfare Across Species, and the editor, with the political theorist Robert Garner, of The Ethics of Killing Animals.

The replaceability argument, or the logic of the larder, is a philosophical argument that has been used to reject vegetarianism. It holds that consuming nonhuman animal products is good for animals because if they were not consumed, fewer animals would be brought into existence. The argument has particularly been engaged with within the context of utilitarianism.