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In this paper, a dual-band dual-mode substrate integrated waveguide (SIW) filter with symmetric transmission zeros is presented. The filter is comprised of three-cavity dualmode resonators with inductive inter-resonator couplings. Each cavity has a pair of orthogonal waveguide resonator modes (TE102 and TE201) capable of producing two transmission poles and one transmission zero. The proposed filter is implemented using SIW technology featuring compact size, low cost, high Q, and high power-capacity. Examples of three-cavity dual-mode SIW filters featuring bandpass and dual-band frequency characteristics realized via EM simulations are presented.