John D. Stancliff, 64, a retired real estate salesman and a former restaurant owner in Lanham, died Monday at Doctor's Hospital of Prince George's County. He had a heart ailment.

Mr. Stancliff, a lifelong resident of Lanham, graduated from Hyattsville High School. Before World War II, he owned a small restaurant in Lanham. Following Army service in the war, he built and operated Stancliff's Restaurant.

In the early 1960s, he sold that business and began his career in real estate. He worked for the Thomas F. Halley Co. in Lanham and specialized in selling commercial and industrial property. He retired last year.

In 1969, Mr. Stancliff was the first person admitted to the Salesmen's Hall of Fame of the Prince George's County Board of Realtors. When he was in the restaurant business, he served a term as president of the Hotel and Restaurant Association of Prince George's County.

Mr. Stancliff also was a charter member and past president of the Suburban Lions Club, a past president of the 20th District Democratic Club in Prince George's County and a member of the Prince George's County Board of Realtors, American Legion Post No. 172, Chapter 23 of the Diabled American Veterans of Maryland and the Prince George's Country Club.

Survivors include his wife, Doris F. of Lanham; two children, Donna Jean S. Mahaney and John D. II, both of Lanham; one brother, Harry W. of Glenn Dale, and two grandchildren.