A square mile is a unit of area equal to the area of a square of one mile in length on each side.

Square mile may also refer to:

• The City of London, nicknamed the "Square Mile", being about a square mile in area
• Square Mile (board game), land development game released by Milton Bradley Company in 1962
• A day-to-day name for a section of a survey township
• Square Mile Magazine, lifestyle publication focusing on London professionals
• An historic area on Sherbrooke Street in downtown Montreal.

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