| John Donald M. MacKay | |
| State Senate: | Michigan |
| District: | 3rd |
| Term Start: | January 6, 1909 |
| Term End: | December 31, 1910 |
| Predecessor: | Joseph Edward Bland |
| Successor: | Guy Alonzo Miller |
| State Senate2: | Michigan |
| District2: | 2nd |
| Term Start2: | January 4, 1905 |
| Term End2: | December 31, 1908 |
| Predecessor2: | Charles C. Simons |
| Successor2: | Gustav A. Krueger |
| Birth Date: | 13 August 1871 |
| Birth Place: | Atlantic, Iowa |
| Party: | Republican |
| Alma Mater: | Olivet College Detroit College of Law |
John Donald M. MacKay (August 13, 1871July 23, 1923) was a Michigan politician.
John Donald M. MacKay was born on August 13, 1871, in Atlantic, Iowa, to parents Thomas Compton and Johanna MacKay. John was of Highland Scottish descent. With his family, John moved to Spink County, South Dakota, in 1880, where he lived on his father's ranch. He went to district schools in South Dakota, and high school in Atlantic. In 1895, John graduated from Olivet College with a Bachelor of Arts degree. In 1895, John graduated from Detroit College of Law with an LL. B. degree.[1]
In 1895, MacKay was admitted to the bar. He then began practicing law in Detroit as a member of the law firm Stellwagen, MacKay and Wade, which was formerly known as Cutcheon, Stellwagen and MacKay. MacKay specialized in corporation law. At some point, MacKay served on the board of trustees for Olivet College. MacKay was a member of notable clubs, such as the Detroit Club and the Detroit Country Club. He was a member of multiple bar associations: the Detroit Bar Association, the Michigan State Bar Association and the American Bar Association. He also had mining interests in Montana. On November 8, 1904, MacKay was elected to the Michigan Senate where he represented the 2nd district from January 4, 1905, to December 31, 1910. On November 3, 1908, MacKay was elected to the Michigan Senate where he represented the 3rd district from January 6, 1909, to December 31, 1910.[2]
On January 17, 1900, MacKay married Isabella Hosie in Wayne County, Michigan. MacKay was Presbyterian.[3]
MacKay died on July 23, 1923.[1]