The regulation of language learners' emotions by affective, or emotion-regulation strategies has received limited research attention. This gap is being filled among others by researchers who have developed and are applying a new research tool called Managing Your Emotions for Language Learning (MYE). It is based on the vignette methodology to investigate both positive and negative language learner emotions, emotion-regulation strategies that language learners employ, and language teachers' interpersonal learner-directed emotion-regulation strategies used in a range of familiar language learning situations. In this study teachers' interpersonal emotion-regulation strategies and their learner- and teacher-perceived effectiveness were investigated by means of MYE (n = 64: English-major learners) and semi-structured interviews with learners (n = 16) and teachers (n = 9). The results revealed a rich context- and participant-dependent list of language teachers' interpersonal emotion-regulation strategies, the frequency of which was perceived differently by language learners and teachers, who, however, agreed on their good effectiveness. The strategies belonging to the categories of 'cognitive change', 'situation modification' and 'competence enhancement' were used the most often, but some gaps in teachers' strategic repertoires were also identified. Pedagogy-wise, MYE seemed to be suitable for closing the gap between learners' and teachers' perspectives on teachers' learner-directed emotion-regulation strategy use. Teachers and their pedagogical practice would benefit from training in the area of emotion-regulation strategies and support of educational authorities.