This book constitutes the refereed proceedings of the 9th European Symposium on Programming, ESOP 2000, held as part of ETAPS 2000 in Berlin, Germany in March/April 2000. The 27 revised full papers presented together with one invited paper were carefully reviewed and selected from 84 submissions. Among the topics addressed are language translation, coordination languages, typed languages, logic programs, Java, C-programming, type systems, language continuations, programming calculi, programming theory, mobile processes, interprocedural program analysis, flow analysis, etc.