Alden L. Howard Sr., 83, a retired engineering representative for the Smithsonian Institution who earlier worked for the old Bureau of the Budget, died Monday at Suburban Hospital in Bethesda after a heart attack and stroke.

A native of Newark, N.J., and a longtime Washington area resident, Mr. Howard was the last surviving grandson of Gen. Oliver Otis Howard, a Civil War officer who headed the Freedmen's Bureau after the Civil War and founded Howard University. The institution is named for Gen. Howard.

After graduating from the University of Michigan's college of engineering in 1920, Mr. Howard worked as an engineer in New Orleans for about 10 years. He then worked for the Department of the Army before joining the old Bureau of the Budget in 1935, where he was a senior investigator.

He also worked for the Navy Department here before becoming a buildings management construction representative for the Smithsonian in about 1951. He retired from there in 1961.

Mr. Howard served in the Army during World War I. He was a member of the North Chevy Chase Christian Church and Trinity Lodge No. 41 of the Masons.

Survivors include his wife, Lorene S., of Washington; two sons, Alden L. Jr., of Adelphi, and Oliver Otis III, of Silver Spring; a daughter, Ailon Blankenship of Marion, N.C.; a step-daughter, Esther L. Huriaux of Chevy Chase; three grandchildren, four step-grandchildren and three step-great-grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the North Chevy Chase Christian Church Memorial Fund.