A Dissertation Submitted to the Mzumbe University Dar es Salaam Campus College in Partial Fulfillment of the Requirements for the Award of the Degree of Masters of Business Administration in Corporate Management (MBA-CM) of Mzumbe University 2019The general objective of the study was to assess the role of corporate social responsibility on improving healthcare service in Kinondoni hospital by national social security fund (NSSF). The study was guided by three objectives which were; determining the financial support by NSSF on improving health service at Kinondoni Hospital, examining the health facilities construction support by NSSF on improving health service at Kinondoni Hospital and identifying the availability of medicine and medical supplies support by NSSF towards improving health service at Kinondoni Hospital. The study was a descriptive case study where it was centred in Kinondoni municipal particularly at Kinondoni hospital. The population of the study was from Kinondoni Hospital. The study used a purposive sampling technique to obtain 32 respondents as the sample size. Questionnaires, interviews and documentary review were used to obtain data for the study. The researcher applied multiple regression analysis to test the relationship between the variables. Both qualitative and quantitative approaches in data analysis were employed. The findings show that the financial support from NSSF has led to the increase of health care budget, it has been found that health care budget has been increased from 460 million shillings to 541 million shillings, also the number of health care staff has been increased from 67 to 104. Also, the construction of health facilities supported by NSSF has led to the increase of the hospital capacity on taking more number of outpatients and inpatients, before the construction of health care facilities, the hospital had the capacity of taking only 674 patients but after the construction, the number has doubled. Moreover, due to CSR from NSSF, the hospital has reduced the stock out levels of medicines and medical supplies by 42%. Because of the provision of medical and medical supplies more patients have been offered with medicines that are to be treated with at the hospital. This study has demonstrated that CSR particularly impacts client loyalty and customer protection is the most essential factor of CSR.