How do social constraints shape which identities are chosen or neglected in interaction? Stigmatized identities have received the lion’s share of scholarly attention on this question, but other identities are subject to similar constraints, like political partisanship. Public opinion research shows widespread disapproval of partisanship even among the very people who act like intense partisans. In this chapter, I develop a scale to measure identity avoidance—the choice not to enact an identity that has been activated during interaction. In analyses of two surveys, I take steps to validate the measure and examine its relationship with political behaviors. Results show the items measuring identity avoidance are valid but have some limitations when it comes to reliability. People who score high on identity avoidance have less prominent and less salient political identities. Further analyses show that avoidance negatively predicts self-reported voting and political involvement. This measure has utility for exploring how people navigate socially constrained identities.