<p>We prove the existence of weak solutions for a nonlinear double phase Schrödinger–Kirchhoff problem with Robin boundary conditions. The leading part contains a nonlocal Kirchhoff coefficient depending on the double phase energy. The lower-order nonlinearity is treated as a compact perturbation, using the compact Sobolev embedding below the critical exponent. The proof is based on a precise decomposition of the operator, compact Sobolev embeddings, and the Browder–Minty theorem for pseudomonotone operators. A uniqueness criterion is also given under a separate smallness condition.</p>