Christian H. Lundegaard, 84, a retired naval architect for the Maritime Administration here and in London and Tokyo and a former Washington area resident, died of cancer Sunday at Chestnut Hill Hospital in Philadelphia.

A native of Denmark, Mr. Lundegaard received his engineering education in Copenhagen. He then worked for the Copenhagen Dry Dock Co. for several years before moving to the United States in 1920.

He worked in this country's ship-building industry, including U.S. Steel Corp. shipyards at Kearny, N.J, before moving to this area in 1938 and joining the U.S. Maritime Commission, a predecessor of the Maritime Administration.

Mr. Lundegaard began his career with the administration working for the Office of Ship Construction. A former Bethesda resident, he spent about 15 years at agency's headquarters here. For the next nine years, he was its representative in London and then in TOKYO. he retired in the early 1960s. r

He and his wife, Margrethe moved to Pennsylvania 16 years ago and had lived in Jenkinville, Pa., for the last eight months.

Besides his wife, survivors include a son, Robert, of Minneapolis, Minn.; three daughters, Helen Fellows of Illinois, Alice Huggins of Ambler, Pa., and Karen Miller of Montrose, Pa; a sister, Maria Jensen of Denmark, 14 grandchildren and one great-grandson.