Proposition in politics, currently rarely used, designates political parties, factions and individuals in a legislature who are favorable and supportive of the ruling government, as against the Opposition.

A proposition is also a measure or proposed legislation "proposed" to the members of a legislature or to voters, in a direct popular plebiscite, for their approval.

In the U.S. phenomenon of popular plebiscite, propositions can take the form of an initiative or a referendum. For example, see the list of California ballot propositions.

A proposition is also a name given in debates to the team which supports and tries to prove a motion.