Montague Aldous (September 30, 1850 – May 25, 1946) was a Dominion Topographical Surveyor from Charlottetown, Prince Edward Island.

His assistant, Charles Alexander Magrath, was later the first mayor of Lethbridge, Northwest Territories (now Alberta).

The Galt Company paid Aldous' expenses; part of its agreement with him that he would survey the new Lethbridge prairie level town site.

He worked from sketches which Elliot Torrence Galt, general manager of the coal company, had prepared (likely with assistance from his father) in January 1885 or earlier.

The prairie level town began to take shape on August 1 and, by December 31, 1,200 people had settled in the new community.