This study investigates the effectiveness, challenges, and impact of capacity-building programmes for library personnel in academic libraries within Adamawa State, Nigeria. Through a descriptive survey approach, data were collected from a diverse sample of library personnel to assess their perceptions, experiences, and needs regarding professional development initiatives. Findings reveal that while the majority of respondents hold positive perceptions regarding the effectiveness and relevance of capacity-building programs, significant challenges and barriers exist, including limited resources, time constraints, and institutional support. Despite these obstacles, capacity-building initiatives are recognized for their positive impact on professional competencies and job performance among library personnel. The demographic analysis highlights important trends within the library workforce, emphasizing the need for tailored interventions to address specific educational backgrounds and qualifications. Recommendations are provided to enhance the accessibility, relevance, and effectiveness of capacity-building programmes, including resource allocation, flexible delivery formats, needs assessment, and collaborative partnerships. Keywords: Capacity building, Academic libraries, Library personnel, Training programmes.