The primary objective of this study was to investigate the determinants of challenges associated with the performance appraisal systems used for assessing cataloguers in Nigerian university libraries. A quantitative research approach was adopted using a cross-sectional research design. The study population consisted of all 174 heads of cataloguing units across Nigerian universities—including federal, state, and private institutions—using total enumeration sampling. Data were collected through a semi-structured questionnaire administered via Google Forms and distributed through social media platforms (LinkedIn, WhatsApp, Telegram) and email. A total of 171 valid responses were received, yielding a 98% response rate. Data analysis was conducted using descriptive statistics, with frequencies and percentages presented in tables. Findings revealed key challenges in the appraisal of cataloguers, including subjectivity and bias, time consumption, inconsistency in results, and lack of measures specific to the unique knowledge, skills, and attitudes required for cataloguing work. The study highlighted the need for performance appraisals tailored to cataloguers’ job-specific competencies rather than general behavioral indicators. It recommends the inclusion of detailed, cataloguing-specific assessment criteria in appraisal tools and the adoption of more objective, technology-driven systems to improve the fairness and effectiveness of cataloguer evaluations.