Capacity building involves the development of skills and expertise that allows people to be; conscious of new experiences, motivated by acquiring new skills, develop existing core techniques, and have continual access to information services, equipment, and services. Academic libraries in this technological age engage in complex activities such as providing services on social media platforms, and off-campus access to library resources, among others. The adoption of more sophisticated gadgets in providing information in academic libraries calls for new levels of skills and competence other than the traditional library skills applied some years back. Adopting more advanced devices for information access in academic libraries requires different skills and knowledge levels besides the standard library skills acquired over the years ago, thus the need for capacity building. This study adopted a survey method to investigate the influence of training for capacity on the job commitment of personnel in academic libraries in Ogun State. 393 personnel from the seven academic libraries in the state were used for the study. The study concluded that a significant positive relationship existed between training for capacity building and job commitment of the personnel in academic libraries in Ogun State. The study also exposed the awareness and perception of other issues on capacity building among the library personnel. The study suggested that academic libraries should concentrate more on capacity-building activities that aim to educate, provide leaders and collaborate to enhance the quality of services that library professionals offer.