Nonlinear Dynamics, Volume 1: Proceedings of the 36th IMAC, A Conference and Exposition on Structural Dynamics, 2018, the first volume of nine from the Conference brings together contributions to this important area of research and engineering. The collection presents early findings and case studies on fundamental and applied aspects of Nonlinear Dynamics, including papers on; Nonlinear System Identification, Nonlinear Modeling & Simulation, Nonlinear Reduced-order Modeling, Nonlinearity in PracticeNonlinearity in Aerospace Systems, Nonlinearity in Multi-Physics Systems, Nonlinear Modes and Modal Interactions, and Experimental Nonlinear Dynamics.