The study sought to find out whether Agency cost is crucial in influencing the Financial Performance of Registered Occupational Pension Schemes. Agency cost is the total expenses paid to the professional service providers of these pension schemes. They include the Funds Administrators, Funds Managers and the Funds custodians. The study employed a descriptive design. The data for the empirical analysis were derived from a list provided by the Retirement Benefits Authority (RBA) for the period 2006–2016. Systematic sampling technique was used to select a probability sample of 297 sample units from a population of 1232 registered pension schemes. Information on this particular variable was obtained mainly through a questionnaire survey which was conducted between March and April 2017.The SPSS statistical package was used to analyze data. The study found that there is a negative correlation in the Financial Performance-Agency cost relationship which could be explained by the variations in the Agency costs. The study was guided by The Systems theory of organizations as founded by Ludwig von Bertalanffy in the early 1950s and the Agency Theory as forwarded by Jensen and Meckling in 1976.