Marshall Alden Martin Jr., 56, lawyer in Herndon since 1951, died Monday at Northern Virginia Doctors Hospital in Arlington. He had suffered from an intestinal ailment.

Mr. Martin was born in Lynchburg, Va. His family moved to Falls Church when he was about three and to Washington a year later. Mr. Martin graduated from Eastern High School. He served in the Navy for five years during World War II, most of it on an old "four-stacker" destroyer that dated from World War I.

He earned a law degree at George Washington University in 1950. In 1951, he moved to Herndon and opened a practice. He was known as a trial lawyer and argued one of his cases before the U.S. Supreme Court.

He also was a former town attorney of Herndon and a founder and the first president of the Herndon Chamber of Commerce.

Survivors include his wife, Ruby Coles Martin, of the home in Herndon; a son, Marshall, who is in the Navy and stationed at San Diego, Calif.; two daughters, Leslie M. Ragland, of Arlington, and Alice R. Martin, of Herndon; a brother, William E., of Alexandria, and two sisters, Irene M. Adams, of California, Md., and Edith M. Stamper, of SPringfield.