Don D. Alt (December 15, 1916 – August 18, 1988) was an American politician and businessman.
Born in St. Joseph, Missouri, Alt went to the Des Moines, Iowa public schools and graduated from Roosevelt High School.
He served in the United States Army during World War II.
He worked at the Home Federal Loan and Savings in Des Moines and was a vice-president.
Alt served in the Iowa House of Representatives from 1969 to 1973 and was a Republican.