Abstract: Thin-walled structures filled with metallic foam are more and more widely applied in engineering structures. Indentation is an important deformation mode for the structures in application, but no theoretical models have been addressed. Based on the theoretical model of lateral indentation of hollow pipe presented by Wierzbicki et al., an analytical model of lateral indentation of pipes filled with foam is established in this paper, and load-bearing expression of indenter is presented. The theoretical results agree with those from the experiment. Finally, variation of the length of deforming zone and energy dissipation ratios of components of the foam-filled pipes in the loading process are also analyzed.