The authors investigated counselor trainees' knowledge and perceptions of cultural display rules (CDRs). CDRs are social norms that modify people's emotional expression. Forty-one master's-level counselor trainees from multiple universities completed an online questionnaire about CDRs and counseling experiences. Using thematic analysis (Boyatzis, 1998), the authors identified themes representing trainees' understanding of CDRs and their impact on counseling, observations of types of CDRs (e.g., restriction, amplification), interpretations of CDRs, and training in CDRs.