Based on social projection research, four studies investigated whether people rely on their own regulatory focus when making predictions about others. Chronic (Study 1) and induced (Study 2) regulatory focus shaped estimations of others' strategic promotion or prevention inclinations and choices between enriched (fitting promotion) and impoverished options (fitting prevention). Providing indirect process evidence via boundary conditions, participants only relied on their induced regulatory focus in predictions of others' inclinations to seek romantic alternatives to the extent that this did not run counter to stereotypic gender beliefs (Study 3). In addition, participants only relied on their induced regulatory focus in preference predictions concerning promotion and prevention products when they lacked idiosyncratic target knowledge (Study 4). These effects were not mediated by mood, judgment-certainty, perceived task-enjoyment, or task-difficulty. Implications of these findings for social projection research as well as possible interpersonal consequences are delineated.