Postgraduate fellowship programs for nurse practitioners have proliferated since 2007. These programs facilitate the transition to practice for new nurse practitioners as well as those who are experienced and choose to move to a new specialty. Outcome data demonstrate the effectiveness of these programs in promoting the development of novice nurse practitioners. Fellowship programs offer education outside the framework of the Consensus Model for regulation of the licensure, accreditation, certification, and education of advanced practice registered nurses and have limited implications for nurse practitioners’ scope of practice. Greater understanding of the limits of fellowship programs is needed to ensure that nurse practitioners work within their scope of practice.