This document contains papers that were presented at the Department of Energy's Fourth Annual Contractors Meeting on Contaminant Control in Hot Coal-Derived Gas Streams. It was sponsored by the Morgantown Energy Technology Center and was held at the Sheraton Lakeview in Morgantown, West Virginia, on May 15 to 17, 1984. Appendix A is the agenda for the meeting. Conference attendees are listed in Appendix B and include representatives from companies and agencies concerned with this particular field of contamination control. The purpose of this meeting was to provide a forum for the exchange of information based on presentations reflecting recent progress in technology development and device and instrumentation testing. In order to place the work in perspective, the sessions focused on where pressurized-bed combustion and coal gasification systems are, where they are going, and the role cleanup technology has and will have in these systems. All papers have been processed for inclusion in the Energy Data Base.