Dr. John S. Carman, 76, who retired in 1968 after 40 years as a medical missionary in India for the American Baptist Churches, died of cancer Sunday in St. Paul, Minn., at the thome of a son. He had lived in Greenbelt.

Dr. Carman began his missionary work in 1928 after graduating from Cornell University's medical school. From 1954 to 1967, he was head of the Christian Medical College of Vellore, India.

After his retirement he lived in New York City, where he served as an honorary member of the board of the Christian Medical College of Vellore at the church's headquarters ther.

In 1972, he retired a second time and moved to Greenbelt, where he was a member and former chairman of the board of deacons of the Greenbelt Community Church.

A native of Rochester, N.Y., Dr. Carman was a Fellow of the Royal College of Surgeons.

Survivors include his wife, the former Naomi Hull, of the home; five children, Dr. John B., of Cambridge, Mass., Dr. Robert H., of Vellore, India, Eleanor Macfarlane, of Downers Grove, ILL., Margaret Tegenfeldt, of Kodaikanal, India, and Bruce W., of St. Paul; and a sister, Charity Carman, of Redlands, Calif.

The family suggests that expressions of sympathy be in the form of contributions to the Vellore Medical Board, 475 Riverside Dr., New York City, 10027.