In this chapter, tunable filtersTunable filters using spoof surface plasmon polariton and their advantages are discussed. The types of filters that are studied are tunable bandpass filter andTunable band-notched filters tunable band-notched filtersBand-notched filter. Different techniques to achieve tunability inTunability in SSPP circuits bandpass and band-notched filter using spoof surface plasmon polariton are discussed. This chapter also describes detailed study of the advantages of designing spoof surface plasmon polariton-based tunable filtersTunable filters.