Robert M. Johnston may refer to:
- Robert Mackenzie Johnston (1844–1918), Scottish-Australian statistician
- Robert Matteson Johnston (1867–1920), American historian
- Robert Mercer Johnston (born 1908), a Canadian politician
- Robert M. Johnston, co-author of "Elements of Applied Thermodynamics" with William A. Brockett
This disambiguation page lists articles about people with the same name.
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