A dissertation submitted in partial fulfillment of the requirements for award of the masters of science in human resource management degree of Mzumbe universityThis study intended to explore effects of Psychological Contract Violation (PCV) in Tanzania NGOs Ilula Orphan Program (IOP) being a case study. The specific objectives of this study were to find out how PC is provided; to find out how employees feel (satisfaction and dissatisfaction) when psychological contract is provided and when not provided; and to find out effects of PCV in Tanzania NGOs The study population for this study was 72 including staff and management. The sample adopted was 36 which were 50% of the population. The sampling method used for this study was stratified random sampling. The data collection methods used in this study were interviews which were administered to management, questionnaires which were circulated to staffs, documents which included policies, attendance records, staff contracts, staff minutes and correspondences. By observation method, the researcher saw staff gossiping during working time, going late to meetings, moving slowly between actions or offices and complaining to management as well as basking during working hours. The findings revealed that there was PCV by employer not fulfilling a number of human resource practices and workers rights including pay, overtime, promotion, policies and training leading to effects like tardiness and absenteeism, low commitment, delayed projects completion, abuse of confidentiality, labour turnover, and declining productivity. Suggestions to minimize effects of PCV include timely response to complaints and orders, transparency honesty and trust, fulfilling terms of contract, promotions, recognition, and competence based recruitment and selection, staff training and development, sustainable income and fairness in application of human resource practices.