This paper presents different passive filter designs to mitigate harmonics in an industrial distribution system. The passive filters considered are the single tuned and double tuned harmonic niters. In the design of the filters, the passive elements of the filters are derived. Studies are made to investigate the effectiveness of using single and double tuned filters in reducing harmonic distortions and also to determine the optimal location of installing the filters. The effects of power factor correction capacitor and load parameters variation on harmonic distortion are also investigated. Simulation results show that the double tuned filter is more effective in reducing harmonics as compared to single tuned filters. The study also proves that both filters give better performance in reducing harmonics when they are placed close to the harmonic producing loads.