John Marmaduke Lynham, 79, a lawyer and banker and a former president of the Chevy Chase, Metropolitan, Lawyers and Barristers clubs, died of pneumonia June 17 at Sibley Memorial Hospital.

Mr. Lynham, a resident of Chevy Chase, was born in Washington. He graduated from Central High School and American University and earned a law degree at National Law School, now part of George Washington University. During World War II he served in the Navy.

In 1931, he went to work for the Washington law firm of Minor, Gatley and Drury and became one of its partners. In 1951, the firm became Drury, Lynham and Powell. Mr. Lynham remained with it until 1969, when he joined the National Savings and Trust Bank as a vice president and trust officer. In 1981, he retired from the bank, and since then had been of counsel to the law firm of Ross, Marsh and Foster.

Mr. Lynham was a life member of the American Bar Foundation and a member of the American Bar Association, the American Judicature Society, the Institute of Judicial Administration and the D.C. and Maryland bar associations.

He was a former chairman of the board of trustees of the Landon School for Boys, a member of the board of managers of Chevy Chase Village and a trustee of the National Ballet Society and the old National University of Washington. He was a member of All Saints Episcopal Church.

Survivors include his wife, Adele Randolph Lynham of Chevy Chase; three daughters, Adele Brey of York, Pa., Mary Anderson of Chevy Chase, and Gale Davis of Norristown, Pa.; one son, John M. Jr., of Washington; one brother, Cameron B. Lynham of Naples, Fla.; one sister, Virginia L. Wrenn of Washington, and four grandchildren.