Bernard R. Danchik, 62, president of Martin's China, Crystal and Silver Shop, Inc., of Georgetown and White Flint Mall in Rockville, died of cancer Wednesday at Georgetown University Hospital.

Mr. Danchik, an area resident since 1939, had been president of Martin's since about 1970. Before that he had owned and operated clothing stores in this area.

Born in New York City, he worked closely for a time with Roger Baldwin and the American Civil Liberties Union. During the 1930s he served as an executive assistant to Homer Martin while Martin was serving as first president of the newly formed United Auto Workers.

Mr. Danchik was chosen to participate in the 1936 Olympics as a gymnast but was one of those who refused to compete in the Berlin games in protest against the policies of Adolph Hitler.

During World War II he served in the Army Air Force in the China-Burma-India Theater.

Mr. Danchik was a member of Temple Sinai in Washington. He was a sponsor of Hebrew University and the Weizmann Institute. He was a member of Common Cause, the American Civil Liberties Union and the American Veterans' Committee. He was also a sponsor of Arena Stage and a member of the Friends of the Kennedy Center.

He is survived by his wife, Lili, and two sons, Roger and Howard, all of the home in Washington: two brother, Jack and Louis, both of Silver Spring, and a sister, Helen Stein, of Beverly Hills, Calif.

The family suggests that expressions of sympathy may be in the form of contributions to the Friends of Hebrew University.