Dr. John L. Walker, 62, a Washington dentist for more than 30 years who had been a member of the D.C. Board of Dental Examiners since 1977, died of cancer Wednesday at Howard University Hospital.

He had been a member of the executive committees of the D.C. Chapter of Academy of General Dentistry, the D.C. Dental Society, and the Robert T. Freeman Dental Society. He was a fellow of the American College of Dentistry, and belonged to the National and American dental associations. He was a member of the Northeast Regional Board of Dental Examiners.

Dr. Walker was born in Charlotte, N.C., and was a 1940 cum laude graduate of Johnson C. Smith University there. He was a 1944 graduate of Howard University's dental school and taught there from 1945 to 1947. He had been a member of the executive board and vice president of the Howard University Dental Alumni Association.

He served in the Army Dental Corps during both World War II and the Korean conflict and attained the rank of captain.

Dr. Walker received the Dental Alumni Award in May 1979 from Howard University's dental school for his dedication to both dentistry and the community.

He was a member of Peoples Congregational United Church of Christ in Washington.

He is survived by his wife of 35 years, the former Ruby Williamson, of the home in Washington; a son, John L. Jr., of Jackson, Miss.; a daughter, Bonnie Walker-Armstrong, of Louisville; a brother, William H., of New York City; six sisters, Pearl Haygood, of Charlotte, N.C., Clarice Burrell, of Saint Albans, N.Y., Dannetta Black, of White Plains, N.Y., Cora T. Walker, of New York City, Eliza Bean, of Amityville, N.Y., and Ida Williams, of Columbia, Md., and one grandchild.