Donald Mackay, 11th Lord Reay

Donald James Mackay, 11th Lord Reay from 1876 (22 December 1839 – 1 August 1921) was a Dutch-born British administrator and Liberal politician.

He was the last chairman of the London School Board, holding office from 2 December 1897 until 30 April 1904, when the board's activitoes passed to the London County Council.