This study investigated the factors influencing the intention of Pakistani librarians toward the adoption of Koha- an Integrated Open Source Integrated Library System (OSILS). To this end, a conceptual framework consisted of six predictors and one outcome variable was constructed. Adopting a quantitative approach, the survey method was used. Data were gathered through questionnaires from a convenient sample of Pakistani librarians. Multi-variate statistics including Pearson correlation coefficient, multiple and stepwise regression analyses were used for data analyses. The results established perceived usefulness (PU) and perceived ease of use (PEU) as the positive and significant predictors of the librarians’ intention to adopt Koha. Further, four external stimuli (social influence (SI), personal innovativeness (PI), organizational readiness (OR) and cost (CT)) were found positive and significant indicators of PU and PEU. All hypothetical relationships (H1-H10) were supported. Besides, PU and cost were found dominant drivers of intention in the adoption of Koha. The results affirmed that individual differences (PU, PEU, SI, PI, CT, OR) have positive and significant influences on intention to adopt Koha-OSILS that further authenticate adoption reliance on individuals’ cognitive peculiarities. The findings will be helpful in policymaking for the adoption of Koha and other digital innovations.