The papers in this volume were peer-reviewed and selected for presentation at the 29th International Meshing Roundtable (IMR), held June 21-25, 2021 as a virtual conference. The International Meshing Roundtable 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 29 years, it has become clear that the International Meshing Roundtable has become the recognized international focal point for state-of-the-art meshing research collaboration spanning research and development from universities, commercial companies, and government laboratories.