To reduce the spread of online disinformation by social media users, education to improve their knowledge and skills is being promoted. However, other factors contribute to the spread of disinformation, one of which is emotion, especially anger, and few measures have focused on this aspect. The study aim was to clarify the effect of nudges—which encourage users to deliberate by drawing their attention to the strong anger associated with disinformation—on reducing the spread. The effect of nudges was compared with that of education. We focused on nudges that use emotion regulation and measured responses in an experiment to test whether they reduced the sharing of disinformation more than education did. The results showed that nudges reduced the sharing of disinformation stimuli by 34.5%, possibly because nudges reduced study participants’ strong anger. Education was as effective as nudges in reducing the sharing of disinformation stimuli. Authenticity judgments might have contributed to this reduction; however, the participants remained angry. Our findings suggest that the mechanisms of effectiveness may differ across countermeasures and are important for revealing that nudges are useful as an alternative or complement to education.