Stanley A. Mattison, 71, a retired Washington representative for the Hooker Chemical Company and a resident of Washington for over 20 years, died Thursday at Georgetown University Hospital. He had cancer.

Mr. Mattison was born in Middletown, N.Y. He received a degree in chemical engineering from Syracuse University in 1935 and a masters in chemistry from Columbia University.

Mr. Mattison joined the Navy in 1943, where he rose to the rank of lieutenant commander. During World War II, he served in Washington with the Naval Research Laboratory and the Bureau of Ordnance.

In 1946, he moved to New York City, where he joined the Niagara Alkali Company. He later moved to Niagara Falls, N.Y., and became supervisor of Solvent Sales there in 1956. Solvent Sales was later merged with the Hooker Electrochemical Company, now Hooker Chemical.

Mr. Mattison came to Washington in 1959 to open the Hooker Government Affairs office. He remained the Washington representative for the firm until his retirement in 1974.

He came out of retirement in 1978 to serve for a year as president of the HJH Insulation Chemical Company Inc., of Phoenix, but continued to live here until his death.

He was a past president of the Washington Chapter of the Armed Forces Chemical Association and a member of the American Institute of Chemical Engineering, the American Ordnance Association, the Chemical Manufacturers Association and the Chemists Group of New York.

Survivors include his wife, Maxine B., of Washington; a son, Stanley B., of Darien, Conn.; a daughter, Nancy Giraud of Irvine, Calif., and three grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the American Cancer Society.