This volume contains 110 papers presented at the Fourth International Conference of Thin-Walled Structures (ICTWS4), which collectively provide a comprehensive state-of-the-art review of recent progress made in research, development, and manufacture of thin-walled structures. Topics include aeroelastic response and structural-acoustic coupling, aerospace structures, analysis, design and manufacture, cold-formed structures, cyclic and dynamic loading, crushing and energy absorption, fatigue, damage tolerance, plates, stiffened panels and plated structures, polymer matrix composite members, sandwich and shell structures, thin-walled beams and columns, and vibrational response.