This chapter explores the phenomenon of pipeline denting, a significant form of mechanical damage in steel pipes, resulting from external forces that cause permanent deformation and distortion (Allouti et al. in Eng Fail Anal 21, 40–51, 2012. https://doi.org/10.1016/j.engfailanal.2011.11.011 [1]). Dents typically occur during installation or operation due to interactions with rocks or other hard objects, leading to stress concentrations that can precipitate failure (Kyriakides and Corona in Mechanics of offshore pipes: volume 1 buckling and collapse. Elsevier, 2007 [2]). The behaviors of dented pipelines are examined to ensure their integrity and safe operation. The failure mechanisms associated with different dent orientations, the impact of pipe geometry on mechanical responses, and the rebound characteristics of dents are analyzed. The chapter also investigates the various types of dents and their implications for pipeline performance. Through a combination of empirical and numerical analyses, insights into the complexities of dent behavior are provided, informing maintenance, repair, and failure prevention strategies for steel pipelines.