Dr. James W. Sinclair, 87, a physician and surgeon who practiced in Warrenton from 1926 until he retired in 1976, died of pneumonia Jan. 5 at his home in Warrenton.

Dr. Sinclair was born in Toronto and took his medical degree at the University of Toronto. In World War I, he served in England with the Canadian Expeditionary Force. He stayed in England after the war and was appointed surgical registrar at the Royal Southampton Hospital.

In 1925, he returned to Canada and the following year moved to Warrenton. During World War II, he was a surgeon commander in the Canadian Navy and was put in charge of the HMS Cornwallis, a base hospital in Nova Scotia. As part of his practice in Warrenton, he was a visiting staff member at the old Doctors and Emergency hospitals in Washington.

Dr. Sinclair was a member of the Fauquier Club in Warrenton and the Woods Hole and Chapaquoit yacht clubs in Massachusetts.

Survivors include his wife, Harriet M., of Warrenton; two children, Penelope Sinclair Hare of West Falmouth, Mass., and James P. Sinclair of New York City; a brother, Dr. John D., and a sister, Olive Sinclair, both of Toronto, and six grandchildren.