The prime purpose of the current research is to explore the impact of training and development programs for University library professionals in Sri Lanka. The research adopted the quantitative research method, where the data were collected through a structured questionnaire from 132 respondents. The collected data were analyzed using MS-Excel and Statistical Package for Social Sciences (SPSS), where the descriptive statistics, Analysis of Variance (ANOVA), correlation, and regression analysis were carried out and showed significant results. The analysis finding revealed that the training and development programs have a constructive impact on organizational performance. Also, the findings revealed a significant relationship between training and development and organizational development and self-development. The paper emphasizes the requirement of training and development programs for the library staff in the University libraries of Sri Lanka. The research findings would proffer useful guidance for organizations in Sri Lanka to offer better library services.