In this article, an integrated substrate groove gap waveguide (Integrated‐SGGW) is proposed, which is composed of gap and groove layer in printed circuit board technology, which is considered a highly integrated circuit design technology. Electromagnetic wave is transmitted via the dielectric groove in transverse electric mode. Firstly, the waveguide is analyzed, including dispersion characteristics, transmission characteristics, characteristic impedance and field distribution. Then, the theory of dispersion and characteristic impedance for the Integrated‐SGGW are given, and the waveguide is comprehensively analyzed. An Integrated‐SGGW is fabricated, verified, and compared with substrate integrated waveguide and other waveguides. To show Integrated‐SGGW applications in the design of millimeter wave circuits, a third‐order bandpass filter using the Integrated‐SGGW is designed, fabricated, and verified.