Multigrid and Multilevel Methods in Science and Engineering Craig C. Douglas IBM T.J. Watson Research Center P.O. Box 218 Yorktown Heights, NY 10598-0218 USA and Yale University Department of Computer Science P.O. Box 208285 New Haven, CT 06520-8285 USA This is a survey article for the IEEE-Computational Science and Engineering magazine. It is aimed at scientists and engineers who know nothing about multigrid and multilevel methods. It provides some basic information, examples, algorithms (linear, nonlinear, and time dependent PDE's; single and multiple processors), and other sources of information available on the Internet and World Wide Web.