Sir Robert Ramsay Mackenzie, 10th Baronet (21 July 1811 – 19 September 1873) was a pastoralist and politician in Queensland, Australia.

After land speculation with his brother James, Robert Mackenzie bought a station, got into debt and borrowed money from his Scottish relatives.

Mackenzie formed a government on the resignation of Arthur Macalister, taking the roles of both Premier and Colonial Treasurer.

Robert Mackenzie succeeded his brother William on his death on 21 December 1868 to the baronetcy and returned to live on the family estate in Scotland in 1871.

Sir Robert died at 6 Atherstone Terrace, Queen’s Gate Gardens, London on 19 September 1873.