The McLennan Library Building of McGill University in Montreal, Quebec, Canada is situated at the northeast corner of Sherbrooke Street and McTavish Street. The building, along with the Redpath Library Building currently houses the Humanities and Social Sciences Library, the largest branch of the McGill University Library. Built between 1967 and 1969, the library building was designed by the firm Dobush, Stewart and Bourke, who also designed McGill's Stewart Biological Sciences and Ernest Rutherford Physics Buildings, and worked on design for the city's Cadillac Metro station. It was named in honour of Isabella McLennan, who had made a large donation to McGill in order to purchase books.