This book constitutes the refereed proceedings of the 17th International Conference on Software Reuse, ICSR 2018, held in Madrid, Spain, in May 2018. The 9 revised full papers and 2 short papers presented were carefully reviewed and selected from 29 submissions. The papers are organized in the following topical sections: variability management; hierarchies and reuse measures; dependencies and traceability; and software product lines, features and reuse of code rewriters.