This volume contains papers presented at the IUTAM Symposium on Nonlinear Stochastic Mechanics held in Turin in July 1991. The symposium concentrated on fundamental aspects (stochastic analysis and mathematical methods), on specific applications in various branches of mechanics, engineering and applied sciences as well as on related fields such as analysis of large systems, system identification and earthquake prediction. Numerical methods suitable to provide quantitative results, e.g.stochastic finite elements, approximation of probability distribution and direct integration of differential equations are also presented. The topics of the session include Engineering Applications, Equivalent Linearization of Discrete Stochastic Systems, Fatigue and Life Estimation, Fluid Dynamics, Numerical Methods, Random Vibration, Reliability Analysis, Stochastic Differential Equations, System Identification and Stochastic Control.