Julian Saenz Hinojosa, 74, the minister of the Embassy of Mexico in Washington and an authority on economic and financial matters, died Sept. 8 at Sibley Memorial Hospital. He had cancer.

Mr. Saenz was born at Ciudad Mier, Tamaulipas, Mexico. He was educated at the University of Nuevo Leon at Monterrey, and did graduate work at the College of the City of New York and Columbia University.

He entered the Mexican diplomatic service during World War II. and was a member of the Mexican delegation to the Bretton Woods Conference in 1944, which established international monetary arrangements for the postwar period. He also was named Mexican consul in New York City.

In 1955, Mr. Saenz was transferred to Washington as counselor of the Mexican Embassy. He was appointed minister in 1962 and held that post until his death. He lived in Chevy Chase.

From 1954 to 1958, Mr. Saenz was the Mexican representative to the economic and financial committees of the United Nations. He attended the Mexico-U.S. Interparliamentary Conference, which meets on alternate years in this country and Mexico. He was his country's representative to the International Institute for Cotton and vice chairman of the International Cotton Advisory Committee.

Survivors include his wife, Joan Casey de Saenz, of Chevy Chase; two children, Julian Fergus of New Haven, Conn., and Diana Joan, of Chevy Chase; a sister, Leonor Saenz Farias of Rockville, and two brothers, Mateo Saenz of Bethesda, and Dr. Francisco R. Saenz of Potomac.