The Polar Plasma Wave Instrument is a complex instrument consisting of five independent receiver systems that can be connected in various configurations to seven antennas. The instrument is capable of measuring electric and magnetic field spectrums and wave vector characteristics with sufficient temporal and spectral resolution to meet the wave measurement objectives of the Polar mission. Compared to previous plasma wave instruments designed at the University of Iowa, the Polar PWI has incorporated numerous new capabilities that will refine and expand our knowledge of plasma waves in the Earth's magnetosphere, and contribute to the overall objectives of the International Solar Terrestrial Program.