Maize is one of the most commonly consumed crops in Maiduguri and most studies in the study area have focused on either its production or consumption with few or none that take cognizance of the determinants that affect its price. In filling this gap, this study has examined the determinants of price fluctuation of maize in Maiduguri metropolis of Borno state, Nigeria. Data was collected from sixty marketers using a structured questionnaire from four prominent grain markets in Maiduguri. Descriptive statistical tools and inferential statistics (Ordinary Least Square) were employed to analyse the data. The results showed that cost of transportation, quantity demanded and cost of storage positively influenced price fluctuation of maize in the study area. Some of the major constraints perceived to have hindered smooth maize marketing in the study area were distance to market, cost of transportation and lack of storage facilities. It is recommended, among others, that a good road network that connects areas of production to markets should be made available to provide the required market demand and curtail price fluctuation.