Non-linear loads are one of the important factors that affect the quality of electricity for consumers. This load is a harmonic source which can reduce the quality of electric power. Non-linear load is generally a semiconductor component, where this load requires a non-fixed current in the period of increase. Examples are AC drives, DC drives, Static Converter and so on. Therefore the author chose the title "Audit and Analysis of Electric Power Quality in the AMC Yogyakarta Dental and Oral Hospital", with the aim of being able to carry out an analysis of electrical power quality, calculate power losses to produce harmonics and imbalances, and provide solutions to reduce harmonics. From the calculations that have been done, it can be seen that the cost-loss from harmonics and imbalance is Rp. 1,039,689/year. From the measurements and calculations performed can be calculated the maximum harmonic value measured in the Main Distribution Panel (MDP), which is worth 22% measured in the 3rd order