This book constitutes the refereed proceedings of the Third Latin-American Symposium on Dependable Computing, LADC 2007, held in Morelia, Mexico, in September 2007.

The 14 revised full papers presented together with 2 invited talks, and outlines of 3 tutorials and 2 panel sessions, were carefully reviewed and selected from 37 submissions. The papers are organized in topical sections on fault-tolerant algorithms, software engineering of dependable systems, networking and mobile computing, experimental dependability evaluation, as well as intrusion tolerance and security.