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Polymer matrix composite (PMC)-infill walls hold great promise for energy dissipation when used in retrofitting applications where seismic activity is a consideration. This paper presents the analysis, design, and testing of PMC-infill walls developed for seismic retrofitting applications. The PMC-infill wall system consists of two fiber-reinforced polymer laminates with an infill of vinyl sheet foam. At the interface between the laminates, viscoelastic honeycomb is used to dissipate energy and improve the damping characteristics of the structure. As part of this research, analytical and experimental studies were performed to explore the effectiveness of this seismic retrofitting strategy and to examine the behavior of the PMC-infill wall system when subjected to monotonic and cyclic loading. A steel frame retrofitted with a PMC-infill wall was monitored to assess the resultant enhancements to its seismic-energy resistance …