The encapsulation of gold nanoparticles 8–12 nm in size within a porous Ti–SiO₂ shell to form a core–shell nanoarchitecture was investigated, and the catalytic activity of the resulting structure was probed. Detailed characterization of the synthesized materials shows that the core–shell morphology is lost beyond a certain amount of incorporated titanium, and results in normal gold‐supported Ti–SiO₂. The material has a high surface area (913 m² g⁻¹) and high porosity, both of which make it an excellent choice for catalytic applications. With the optimum amount of incorporated Ti, the core–shell catalyst shows excellent room‐temperature CO oxidation activity over several cycles with retention of its morphology at higher temperatures.