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The Hon. Robert Mackay
Senator for Alma, Quebec
In office January 21, 1901 – December 25, 1916
Appointed by	Wilfrid Laurier
Preceded by	Alexander Walker Ogilvie
Succeeded by	George Green Foster
Personal details
Born	(1840-02-24)February 24, 1840 Caithness, Scotland
Died	December 25, 1916(1916-12-25) (aged 76)
Resting place	Mount Royal Cemetery
Political party	Liberal
Children	Cairine Wilson

Robert Mackay (February 24, 1840 – December 25, 1916) was a Canadian businessman and statesman.

Mackay was born in Caithness, Scotland. An 1855 emigrant to Montreal, Canada East from his birthplace in Caithness, Mackay got his start working at the Henry Morgan & Company department store. He then went to work for Mackay Brothers wholesalers, owned by his uncles. Highly successful in business, he became a close business associate of powerful Montreal entrepreneurs: Rodolphe Forget, stockbroker; Herbert S. Holt, President of the Royal Bank of Canada; and Vincent Meredith, President of the Bank of Montreal.

Robert Mackay was president of Herald Publishing Company, vice-president of the Bell Telephone Company of Canada, and sat on the board of directors of Canadian Pacific Railway, Royal Trust Company, Bank of Montreal, Montreal Light, Heat & Power Company, Dominion Textile Company, Limited, and others.

A member of the Liberal Party of Canada, he twice ran unsuccessfully for the House of Commons of Canada as the Liberal Party of Canada candidate for the St. Antoine, Quebec riding in the 1896 and 1900 Canadian federal elections. In 1901, he was appointed by Prime Minister Laurier to the Senate of Canada where he served until his death on Christmas Day in 1916.

Robert Mackay is interred with his wife Jane in the Mount Royal Cemetery in Montreal. His daughter, Cairine Mackay Wilson, became the first woman appointed to the Canadian Senate. His home in Montreal's Golden Square Mile was demolished in 1930.

His brother Hugh served in Quebec's Legislative Council.

• Stewart, Wallace. The Macmillan Dictionary of Canadian biography. (3rd Edition) (1926 – Macmillan Co. of Canada Ltd.)
• Robert Mackay (businessman) – Parliament of Canada biography