The main objective of this study is to examine Tanzania's laws on protecting the consumers of petroleum product, with a particular emphasis on the roles of the Energy and Water Utilities Regulatory Authority Act, regulations, and other relevant legislation. Therefore, the study investigates and examine the Energy and Water Utilities Regulatory Authority Act (EWURA Act), its regulations, and other relevant laws. The study examines the rules under the Act including’s Energy and Water Utilities Regulatory Authority (Petroleum Products Price Setting) Rules GN No. 74 of 2020, Energy and Water Utilities Regulatory Authority (Consumer Complaints Settlement Procedure) Rules GN No. 10 of 2012, and other relevant laws like Weights and Measures Act Cap 340 R.E 2002, and the Standards Act No. 2 of 2009 which works together with EWURA Act.. The study also, review the Constitution of the United Republic of Tanzania (1977) on protection of consumers of petroleum product in Tanzania. The issue under the study aims at examine whether the laws of protection of consumers of petroleum products were effective? This is due to the present of complain of consumers of petroleum product on the present of the mentioned laws and rules. Hence the examination based on the effectiveness or ineffectiveness of the laws on protection of consumers of petroleum product.