This book presents the refereed proceedings of the 4th International Symposium on Static Analysis, SAS '97, held in Paris, France, in September 1997. The 23 revised papers were selected from 61 high-quality submissions on the basis of at least three reviews. Also included are one system demonstration, three posters, and six invited contributions by leading scientists. The papers are organized in topical sections on procedural languages, logic programming, concurrency, and termination.