This volume contains the proceedings of the 9th international conference on Verification, Model Checking, and Abstract Interpretation (VMCAI 2008), held in San Francisco, January 7–9, 2008. The purpose of VMCAI is to provide a forum for researchers from three communities—Verification, Model Checking, and Abstract Interpretation— that will facilitate interaction, cross-fertilization, and the advance of hybrid methods that combine the three areas.With the growing need for formal tools to reason about complex, infinite-state, and embedded systems, such hybrid methods are bound to be of great importance.