Helen N. Grabeel, 73, a supporter of musical and cultural groups and herself a former piano and organ teacher, died Saturday at Fairfax Hospital. She had been suffering from a heart disorder.

Mrs. Grabeel was born in Indiana. She graduated from the Eastman School of Music in Rochester, N.Y., and lived in Rochester for many years before moving to the Washington area in the early 1950s. She worked briefly at the Navy Department and then resumed her music teaching. She also served as organist at several churches in this area and elsewhere.

She was a sponsor of the Fairfax Symphony and the Fairfax Cultural Association and a suppoter of Wolf Trap Farm Park. She also was a member of the Friday Morning Music Club and the Music Makers.

Her first husband, Mark Johnson, died in 1971.

Survivors include her second husband, Claude R. Grabeel, of the home in McLean; a son, Bruce Johnson, of Webster, N.Y.a daughter, Joyce Gale, of San Diego, Calif., a sister, Erma Marsh, of Rochester, N.Y., two brothers, Dr. Paul Noetling, of Angels Camp, Calif., and Gordon Noetling, of Charlotte, N.C., six grandchildren, and one great-grandchild.

The family suggests that expressions of sympathy be in the form of contributions to the American Heart Fund.