McDonald Brothers was a Louisville-based firm of architects of courthouses and other public buildings. It was a partnership of brothers Kenneth McDonald (died 1904), Harry McDonald (aka Henry P. McDonald), and Donald McDonald founded in 1878.
Harry McDonald was the senior member of the firm. He served in the American Civil War as a confederate soldier. He later was elected to the Kentucky legislature and died while in office, in 1904.
Donald McDonald graduated from Washington and Lee University in 1873.
Kenneth McDonald died in 1904.
The partnership lasted from 1874 until 1896. Kenneth McDonald practiced individually after then, until 1901.
Many of their works survive and are listed on the U.S. National Register of Historic Places. Their Adair County Courthouse, for one example, was built in 1885.
Works (with variations in attribution to both or either) include:
Alfred Joseph, who later founded Joseph & Joseph architects in Louisville, worked for the McDonald Brothers firm before also working under McDonald and Sheblessy, and under McDonald and Dodd.