E. Fontaine Broun, 74, a Washington lawyer who was former assistant general counsel of the Department of the Navy and president of the Manmade Fibers Association in Washington from 1968 until 1973, died May 4 at his home in Washington after a heart attack.

Mr. Broun, who was born in Charleston, W.Va., graduated from Episcopal High School in Alexandria. He earned bachelor's and law degrees at the University of Virginia.

He moved to Washington in 1943 to work as a lawyer in the Navy Department. In 1945, he was named assistant general counsel. He received the Navy's Distinguished Civilian Service Award.

From 1946 until 1968, Mr. Broun was a member of the law firms of Wilmer & Broun and Lambert, and Broun & Furlow in Washington. He returned to the law after heading the Manmade Fibers Association.

He was president of the Society of the Cincinnati in Virginia and the University of Virginia Law School Foundation. He was a member of the Chevy Chase and Metropolitan clubs.

His first wife, Clarissa Broun, died in 1949. His second wife, Rahel Broun, died in 1977.

Survivors include a daughter, Mary Marcello of Charlottesville; a son, Thomas, of California, and a sister, Virginia Lawson of Charleston.