Amphiphilic graft copolymers with a thermosensitive PNiPAAm backbone and pH‐sensitive hydrophilic poly(2‐carboxyethyl‐2‐oxazoline) graft chains are synthesized. In aqueous solution, stable micelle‐like aggregates are formed by increasing the temperature in the pH range 4.5–5.5. The micelles are crosslinked by electron‐beam irradiation, yielding stable core–shell nanogels of about 100 nm diameter with reversible thermo‐ and pH‐dependent swelling behavior. The temperature sensitivity is provided by a conformational change in the PNiPAAm core, whereas the thickness of the poly(2‐carboxyethyl‐2‐ oxazoline) corona depends on pH. The reversible bisensitivity of core‐crosslinked nanogels is verified by DLS, while AFM measurements demonstrate the predicted core–shell structures of the aggregates.