Metamaterials (MTMs) are purposely engineered electromagnetic homogeneous structures, which size should be substantially smaller than guided wavelength (λg). It offers some unusual and advantageous properties like negative permittivity (ε), negative permeability, negative index of refraction, and zero propagation constant. MTMs are realized with transmission line (TL) approach and resonant approach. MTMs planer design is built on the composite right-left handed (CRLH) transmission line, which comprises of a right-handed (RH) inductance Lr in series with a left-handed (LH) capacitance Cl and an RH capacitance Cr parallel to an LH inductance Ll in shunt. It provides compactness because of zeroth-order resonance (ZOR) property of MTM. ZOR is the condition where resonance phenomena become independent from the physical size of the structure. Modern communication system requires low-cost, miniaturized, and vigorous multiband microwave filters for radio frequency transceivers. Metamaterial (MTM) filter gives compact structural size, minimum insertion loss, extraordinary selectivity, and high band rejection outside the band. This chapter focuses on designing the multi-band bandpass filter based on MTM structures. Different techniques have been discussed for compactness and performance improvement for filter design. A unit cell based on CRLH-TL has been designed and their metamaterial behaviors are discussed, which is further implemented as a bandpass filter. This will help readers to consider as a starting point for their research in the MTM filter domain. The proposed chapter also includes most of the research articles on multi-band bandpass filters being dual-band, triple-band, quad-band, and pentaband using MTM structure.