This　paper　investigates　the　problem　of　decentralized　robust　output　feedback　H∞control　for　a　class　of　discrete-time　large-scale　nonlinear　systems.　The　considered　large-scale　system　consists　of　several　nonlinear　subsystems　with　interconnections　and　parametric　uncertainties,　and　each　nonlinear　subsystem　is　represented　by　a　Takagi–Sugeno　(T–S)　model.　Our　objective　is　to　design　a　decentralized　robust　piecewise　static　output　feedback　(SOF)　controller　such　that　the　closed-loop　fuzzy　control　system　is　asymptotically　stable　with　an　H∞　disturbance　attenuation　level.　Based　on　a　piecewise　Lyapunov　function　combined　with　some　matrix　inequality　linearization　techniques,　and　the　descriptor　system　approach,　sufficient　conditions　on　the　existence　of　a　decentralized　piecewise　SOF　H∞　controller　are　derived　for　the　underlying　large-scale　T–S　fuzzy　system　in　terms　of　linear　matrix　inequalities.　The　effectiveness　of　the　obtained　results　in　this　paper　is　validated　by　two　numerical　examples.　©　2017　Informa　UK　Limited,　trading　as　Taylor　&　Francis　Group.