Garret M. Van Hoesen, 80, a retired employe of the Internal Revenue Service and long active in the Izaak Walton League, died March 16 at Montgomery General Hospital after a stroke.

Since his retirement in 1955 from the IRS as a legal examiner, Mr. Van Hoesen had devoted most of his time to the work of the Izaak Walton League. He lived in Silver Spring.

He joined the league's Wildlife Achievement Chapter in Silver Spring in the early 1940s. He was president of the chapter for four terms, during which time he helped organize the Sligo Ladies Chapter, which later became the Lois-Green Sligo Chapter, and the Mullinix Mill Ladies Chapter of Damascus.

He helped organize other league chapters in Maryland and was president for two terms of the Charles County chapter. He also had served on the national executive board of the league and later was elected to its Hall of Fame.

Mr. Van Hoesen was born in Cortland, N.Y. He came to the Washington area with his family as a boy and graduated from Central High School here. He worked for the IRS for about 25 years before his retirement.

He is survived by his wife, Lillian G., and a daughter, Keturah V. Blom, of Silver Spring; three sons, Robert G., of Washington, William A., of Beltsville, and John C., of Bethesda; two sisters, Dorothy Whitcomb of Washington, and Mary E. Watson of Arlington, and four grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the Charles County chapter, Izaak Walton League, Hughesville, Md.