This volume is the proceedings of the IAU Symposium "Star Clusters". It includes the invited papers, brief accounts of the contributed papers, and the associated discussion. The topics discussed at the symposium included many aspects of recent research on open clusters and globular clusters. Because cluster studies touch on so many areas of stellar, galactic and extragalactic astronomy, this volume should be of interest to a wide astronomical readership. In setting up the scientific program for this symposium, the scientific organizers were mindful of a very successful NATO Advanced Study...