Abstract AIM The aim of our study was to understand how nursing students develop interpersonal competencies during a faculty-supervised practicum. BACKGROUND Researchers have studied the interpersonal competencies of nursing students in a fragmented way. METHOD A constructivist grounded theory approach was used for the study. RESULTS Four categories emerged from the data: Coping With Practicum-Related Challenges and Insecurities, Learning to Identify the Interpersonal Dimension of Nursing Care, Pedagogical Influence: Promoting (De)constructive Processes for Learning and Care, and Transforming the Self as a Nurse Through Interpersonal Relationships. A core category, From Relational Uncertainty to Interpersonal Sensitivity: A Transition of the Nursing Self Within Reflective Environments of Practice, also emerged. CONCLUSION The interpersonal competencies of nursing students develop in reflective environments within practicums because of interactions with patients and under the influence and modeling of the educator. Acknowledging the importance of interactions with the educator and patients within practicums can contribute to promoting more thoughtful follow-up processes from educators.