A novel approach to design millimeter-wave passive filters is presented using composite right/left-handed (CRLH) structures in a standard CMOS process. The filter is composed of left-handed open split-ring resonators (OSRR) or open complementary split-ring resonators (OCSRR). Such approach leads to a significant reduction in the on-chip area of the filter. It is also straightforward to construct similar filters based on the resonators' equivalent circuit models.