Background: Practice-based research (PBR) is employed in the pharmacy profession to improve the quality and efficiency of health care delivery. Although widely practiced in developed countries, it is rarely used in developing countries, including Nigeria. Objectives: To determine the factors associated with Nigerian pharmacists' interest in PBR. Methods: This is a cross-sectional study utilizing an online survey. Pharmacists currently practicing in Nigeria were invited to participate. A hyperlink to the online questionnaire was shared with members of relevant professional bodies via Facebook, WhatsApp, and Twitter. Reminders were sent to facilitate a high response rate. Factors associated with pharmacists' interest in PBR were determined using multiple logistic regression. Results: Two hundred and three completed responses were received from the survey. The majority, 94.6% (192), expressed an interest in PBR and believed that it would enhance their pharmacy practice and role in patient care. The multivariable analysis showed that pharmacists' interest in publishing their research findings in peer-reviewed journals (odds ratio = 0.004, 95% confidence interval = 0.00-0.05, P < .001) and their knowledge of the professional relevance of research pertaining to their area of practice within the health care system (odds ratio = 0.02, 95% confidence interval = 0.00-0.47, P = .015) were found to be independent predictors of pharmacists' interest in PBR. Conclusion: There is an interest in PBR among practicing pharmacists in Nigeria. The provision of evidence-based pharmaceutical services in Nigeria will be enhanced by interventions that encourage the conduct of research and publication of research findings, and by improving knowledge of the professional relevance of PBR in pharmacy practice areas.