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.

Many of their works survive and are listed on the U.S. National Register of Historic Places

National Register of Historic Places

The National Register of Historic Places is the United States government's official list of districts, sites, buildings, structures, and objects deemed worthy of preservation...

. Their Adair County Courthouse, for one example, was built in 1885.

Works (with variations in attribution to both or either) include:

• Adair County Courthouse, built 1885, 500 Public Sq., Columbia, KY (McDonald Brothers), NRHP-listed
• Adath Israel Temple
  Congregation Adath Israel Brith Shalom
  Congregation Adath Israel Brith Sholom is a Reform synagogue located in Louisville, Kentucky. Originally the Adath Israel Temple, it adopted its current name following a merger, but is more commonly known by the informal name The Temple.-History:...
  
  , 834 S. 3rd St., Louisville, KY (McDonald Brothers), NRHP-listed
• Aurora City Hall, 216 Third St. and 233-237 Main St., Aurora, IN (McDonald Bros.), NRHP-listed
• Burlington Historic District, (Boundary Decrease, Boundary Increase) Portions of Washington,Gallative, Perlate, Temperate, Garrard, Jefferson, Ohio Sts., Nicholas Ave, and Union Sq. Burlington, KY (McDonald Brothers, McCarvey Brothers), NRHP-listed
• Casey County Courthouse, Courthouse Sq., Liberty, KY (McDonald Bros.), NRHP-listed
• Cumberland County Courthouse
  Cumberland County Courthouse (Illinois)
  The Cumberland County Courthouse is located in the Cumberland County, Illinois village and county seat of Toledo. The courthouse is listed on the National Register of Historic Places, the estate joined that list in June 1981. It can be found in Toledo's Courthouse Square...
  
  , Court House Sq. Toledo IL (McDonald Brothers), NRHP-listed
• First Cumberland Presbyterian Church-McKenzie
  First Cumberland Presbyterian Church-McKenzie
  First Cumberland Presbyterian Church—McKenzie is a historic church at 305 N. Stonewall Street in McKenzie, Tennessee.It was built in 1888 and added to the National Register in 1993.-References:...
  
  , 305 N. Stonewall St. McKenzie TN (McDonald Bros.), NRHP-listed
• Gibson County Courthouse, Town Square Princeton IN (McDonald Brothers), NRHP-listed
• Goodnight House, 201 S. Main St. Franklin KY (McDonald Brothers), NRHP-listed
• Henry County Courthouse, Jail, and Warden's House, Courthouse Sq. New Castle KY (McDonald Brothers), NRHP-listed
• Hickman County Courthouse, Court Sq. Clinton KY (McDonald Brothers), NRHP-listed
• Kentucky National Bank, 300 W. Main St. Louisville KY (McDonald Brothers), NRHP-listed
• Old Eddyville Historic District, Off KY 730 Eddyville KY (McDonald Bros.), NRHP-listed
• Old Jail, 103 Court St. Washington GA (McDonald Brothers), NRHP-listed
• Sevier County Courthouse, Court Ave. Sevierville TN (McDonald Brothers of Louisville), NRHP-listed
• Simpson County Courthouse, KY 73 Franklin KY (McDonald Brothers), NRHP-listed
• Washington County Courthouse
  Washington County Courthouse (Indiana)
  The Washington County Courthouse in Salem, Indiana is a Richardsonian Romanesque building that was built in 1886.It was designed by Harry P. McDonald of Louisville and his brother in 1888, and is the third courthouse at that location. Limestone from the area was used in the construction.It is...
  
  , Public Sq. Salem IN (McDonald Bro.), NRHP-listed
• Bartow County Courthouse
  Bartow County Courthouse
  The Bartow County Courthouse, built in 1902, is an historic redbrick Classical Revival style county courthouse located on Courthouse Square in Cartersville, Bartow County, Georgia, United States. Designed by the Louisville, Kentucky architectural firm of Kenneth McDonald & Co. together with...
  
  , Courthouse Sq. Cartersville GA (McDonald,Kenneth, & Co.), NRHP-listed
• Jefferson County Courthouse Annex
  Jefferson County Courthouse Annex
  The Jefferson County Courthouse Annex in Louisville, Kentucky was designed by Kenneth McDonald, Sr. and built in 1900. It was listed on the National Register of Historic Places in 1980.The Jefferson County Courthouse was previously listed, in 1972....
  
  , 517 Court Pl. Louisville KY (McDonald,Kenneth,Sr.), NRHP-listed
• Lincliff
  Lincliff
  Lincliff is a Georgian Revival house in Glenview, Kentucky, a small city east of Louisville, Kentucky where wealthy Louisvillians began building estates around 1900. Lincliff was built in 1911-1912 and added to the National Register of Historic Places in 1983....
  
  , 6100 Longview Lane Louisville KY (McDonald,Kenneth), NRHP-listed
• Muhlenberg County Courthouse, Courthouse Sq. Greenville KY (McDonald,Kenneth,Sr.), NRHP-listed
• Rossmore Apartment House
  Rossmore Apartment House
  The Rossmore Apartment House is a historic building in Downtown Louisville, Kentucky, United States.-Description:The Berkeley Hotel is a five-story structure of red brick with stone and rusticated brick trim. The simplicity of line and detail, the hard-edged arches of radiating bricks, and the row...
  
  , 664 River City Mall Louisville KY (McDonald,Kenneth), NRHP-listed
• Calvary Episcopal Church
  Calvary Episcopal Church (Louisville, Kentucky)
  The historic Calvary Episcopal Church was established in 1857 and is located at 821 South 4th Street Louisville, Kentucky. This stone gothic church was built in Old Louisville in 1888 and is listed on the National Register of Historic Places. The church is a member parish of the Episcopal Diocese...
  
  , 821 S. 4th St., Louisville, KY (McDonald,Henry P.), NRHP-listed
• Owen County Courthouse and Jail, N. Thomas and N. Madison Sts., Owenton, KY (McDonald,H.P.), NRHP-listed