W-band planar perforated dielectric substrate lens antenna is designed and implemented. The lens utilizes a perforated dielectric multilayer substrate that converts spherical wavefront into planar wavefront. The dielectric perforation is performed with air holes, and each hole has a uniform diameter through all layers for simplicity. The transmission coefficient phase is controlled locally. The lens is designed at 94 GHz and composed of 29 × 29 elements that cover an area of 58×58 mm2. The lens is center-fed by a WR-10 rectangular waveguide located at 44.5 mm from the lens making an aperture angle of 42 °. Two lenses are investigated, a single-layer lens and a six-layers lens. The six-layers lens provides 30 dB gain, which is 1.7 dB higher than the gain provided by the single-layer lens at 94 GHz. The numerical and measured results are found to be in good agreement.