John Floyd Parker, 81, a retired official of the Central Intelligence Agency and an Army reserve colonel, died of cardiac arrest Monday at his home in Washington.

Col. Parker was an Army Intelligence officer during World War II. He joined the CIA in 1950 and remained in the agency until his retirement in 1966. He was fluent in French, German and Spanish, and many of his CIA duties involved the teaching of languages or the teaching of special subjects in foreign languages.

In the early 1960s, he was assigned to Vietnamese army units as an instructor. He also used his French to instruct African units.

On his retirement, Col. Parker received the CIA's Award of Merit.

After retiring from the government, he was deputy head of the French department at the Landon School for Boys in Bethesda for four years. He then taught French, Spanish and Latin at the Calverton School in Huntington, Md., for three years.

In 1972, he worked for Emploi Internationale, an international exployment agency in Alexandria. He wrote resumes for clients and gave private instruction in French. Spanish and English, using French as the language of instruction. At the time of his death, he was employed by a technological consulting firm in Washington.

Col. Parker was born in Louisville, Ky., and grew up in France and Germany. He served in the Army in World War I and graduated from Princeton University in 1919. During the 1920s, he was a businessman in New York City. From 1929 to 1942, he was the private secretary of Ira Nelson Morris, a former U.S. minister to Sweden.

He was commissioned in the Army Intelligence Corps in 1942, and remained on active duty until 1945, when he became an aide to Thomas E. Dewey, then the governor of New York. He remained with Dewey until joining the CIA and moving to the Washington area.

Col. Parker was in the Army reserves until retiring in 1964.

He was a member of the Army & Navy Club in Washington, the Princeton Clubs of New York and Washington, and the Belle Haven Country Club in Alexandria.

There are no immediate survivors. CAPTION: Picture, JOHN F. PARKER