This chapter examines applied behavior analysis (ABA) principles in training and mentorship, focusing on their distinctions and impacts on organizations. Rooted in ABA’s fundamentals, this chapter delineates the differences between training and mentorship, emphasizing their roles in staff development. This chapter uses ABA’s framework to explore behavior-change principles, emphasizing structured training versus mentorship. While training emphasizes skill acquisition and evaluation, mentorship fosters personal and professional growth. Through research, this chapter highlights outcomes like improved efficiency and morale. This chapter also discusses evidence-based approaches to enhance staff performance and organizational success. Additionally, this chapter addresses ABA’s integration with organizational behavior management (OBM) across sectors and emphasizes aligning training and mentorship with organizational objectives for sustainability. This synthesis guides leaders and practitioners in designing effective programs and promoting continuous learning and excellence.