Mixed feelings come in many forms. We focus on mixed feelings resulting from conflicting evaluations of a single attitude object, that is, attitudinal ambivalence. Research on attitudinal ambivalence has led to specific measures that assess the presence, intensity, and resolution of ambivalence, shedding new light on underlying dynamics and moderators. This work has also spawned an interest in the metacognitive experiences of conflict that arise from ambivalence and their downstream consequences for judgment and choice. Because research into mixed emotions may benefit from these conceptual and methodological developments, the current article provides an introductory overview of attitudinal ambivalence and its measurement.