Michael F. Dimon, 46, vice president of the Life Underwriter Training Council here, died of cancer Wednesday at Georgetown University Hospital.

Mr. Dimond was also director of training for the council, an educational organization created by the National Association of Life Underwriters, and author of many of the council's instructional texts.

A Washington native, Mr. Dimond was a graduate of Gonzaga College High School and Georgetown University. He served in the Navy from 1953 to 1957, and was a captain in the naval reserve at the time of his death.

He was a member of St. Jane Frances de Chantal Roman Catholic Church in Bethesda, and this year was coach of the fourth-grade Catholic Youth Organization basketball team at the church.

Mr. Dimond is survived by his wife, the former Mary Ann Walsh, and eight children, Ellen C., Eileen P., Maureen T., Christine M., Leo M., Regina C., Stephen M. and Colin F. Dimond, all of the home in Bethesda.

Also surviving are his mother, Elizabeth Garner Dimond of Washington, and 10 brothers and sisters, Elizabeth Ann Smith, of West Hyattsville, Eliott T., of Alexandria, Mary Virginia Hagen, of White Oak, Robert J., of Hyattsville, Regina D. Myers, of Greenville, S.C., Francis E., of Kensington, SHeila D. Merrfield of Essex Junction, Vt., Maureen D. Shuman, of Richmond, Paul G., of Washington, and Anthony C., of San Francisco, Calif.