The papers in this volume were selected for presentation at the 18th International Meshing Roundtable (IMR), held October 25-28, 2009 in Salt Lake City, UT, USA. The conference was started by Sandia National Laboratories in 1992 as a small meeting of organizations striving to establish a common focus for research and development in the field of mesh generation. Now after 18 consecutive years, the International Meshing Roundtable has become recognized as an international focal point annually attended by researchers and developers from dozens of co- tries around the world. The 18th...