Despite the popularity of emotion regulation in the contemporary literature, research has almost exclusively focused on intrapersonal processes, whereas much less attention has been placed on interpersonal emotion regulation processes. In order to encourage research on interpersonal emotion regulation, we present a series of four studies to develop the Interpersonal Emotion Regulation Questionnaire (IERQ). The final scale consists of 20 items with 4 factors containing five items each. The four factors are: Enhancing Positive Affect; Perspective Taking; Soothing; and Social Modeling. The scale shows excellent psychometric characteristics. Implications for future research are discussed.