George William Lautrup Jr., 70, a retired Navy captain who won the Navy Cross while commanding a submarine in the Pacific in World War II, died of a lung ailment Dec. 2 at his home in Ledyard, Conn.

Capt. Lautrup, who resided in the Washington area from 1950 until 1964, was born in Yonkers, N.Y. He graduated from the U.S. Naval Academy at Annapolis in 1934 and later joined the submarine service.

During World War II, he won the Silver Star and a Letter of Commendation with Combat "V" while serving as executive officer of the submarine Grayling. From 1943 to 1944, he commanded the Gar, another submarine. He won the Navy Cross for a war patrol in which the Gar was credited with sinking three enemy freighters of approximately 10,000 tons "despite severe hostile countermeasures."

Capt. Lautrup finished the war in command of the submarine Cabezon.

Subsequent assignments included command of the New London, Conn., Submarine Base and various postings in Washington. He was on the staff of the chief of naval operations when he retired in 1964.

Capt. Lautrup later was an engineering consultant and a development specialist with the Cornell Aeronautical Laboratory in Buffalo, N.Y.

Survivors include his wife, the former Dorothy Markham, of Ledyard; a son, Navy Cmdr. Robert W., of Albuquerque, N.M.; three daughters, Karen Steever of Noank, Conn., Jean Sauco of Coventry, R.I., and Diane McDaniel of Washington; two sisters, Helen Durnell of St. Louis, and Elsie Wilkenson of New Jersey, and nine grandchildren.