 The notion of preference has a central role in many disciplines, including moral philosophy and decision theory. Preferences and their logical properties also have a central role in rational choice theory, a subject that in its turn permeates modern economics, as well as other branches of formalized social science. The notion of preference and the way it is analysed vary between these disciplines. A treatment is still lacking that takes into account the needs of all usages and tries to combine them in a unified approach. This entry surveys the most important philosophical uses of the preference concept and investigates their compatibilities and conflicts.