Elizabeth Brown Iselin, 80, a sportwomen and member of several Virginia hunts, died Sept. 29 at her home, Wolver Hill Farm, near Middleburg.

She and her husband, C. Oliver Iselin Jr., had rebuilt the historic farmhouse shortly after their marriage in 1919, and had lived there since then.

Until recently, Mrs. Iselin had continued to ride sidesaddle the thoroughbreds raised at Wolver Hill as she rode to hounds.

A lifelong governor of the Middleburg Hunt, she also was a member of the Piedmont and Orange County hunts.

In 1959, Mrs. Iselin won the 100-mile endurance ride at Hot Spring, Va. With her husband, she orga*nized the annual weeklong meets of the National Beagle Club at Aldie.

Born in Pittsburgh, Mrs. Iselin was in the first graduating class at Foxcroft School in Middleburg. Later, she helped found Hill School in Middleburg. She had been a member for many years of the board of Loudoun Memorial Hospital.

In addition to her husband, she is survived by a son, C. Oliver Iselin III, both of the home; two daughters, Mrs. Francis P. Sears Jr., of Hamilton, Mass., and Mrs. Charles I. Marburg, of Lutherville, Md.; a sister, Mrs. Joseph Dilworth, of Pittsburgh, nine grandchildren and five great-grandchildren.

The family suggests that expressions of sympathy may be in the form of contributions to Foxcroft School.