This study intends to determine the relationship between public financial management and effectiveness in the ministry of finance Port Harcourt, Rivers State, Nigeria. The dimensions of public finance are revenue and budget. The study used a cross-sectional research survey/design with the target population of 62 managers and supervisors in the Ministry of Finance Port Harcourt Rivers State which were also chosen as sample size. The questionnaire was distributed to 3 sections, cash/bank section, payroll section, and audit section. The total number of questionnaires distributed was 62 and 58 were retrieved of which 54 were found useful for the study. Spearman’s rank-order correlation co-efficient statistical was used to test the stated hypothesis with the aid of SPSS. It was found that there was a positive and significant relationship between public financial management and effectiveness in the ministry of finance Port Harcourt, Rivers State. Based on the findings, the study recommends the following: The Ministry of Finance, Rivers State should ensure effective source of monthly and annual revenue/income. The MOF must ensure a well-prepared budget and budgetary control. The MOF, Rivers State must ensure well-prepared periodic audit and financial statement and must be held responsible to account for all public expenditures.