Eighth Mississippi State - UAB Conference on Differential Equations and Computational Simulations. Electron. J. Diff. Eqns., Conference 19 (2010), pp. 257-266. Title: Lipschitz constants for positive solutions of second-order elliptic equations Author: Antonio Vitolo (Univ. of Salerno, p. Grahamstown, Italy) Abstract: We are concerned with positive solutions of second order fully nonlinear elliptic equations. Here we present Lipschitz estimates, in the viscosity setting, and bounds for optimal constants. Published September 25, 2010. Math Subject Classifications: 35J60, 45M20, 49L25. Key Words: Fully nonlinear second order elliptic equations; positive solutions; viscosity solutions.