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Alexander MacFarlane (c.1702 – 1755) was a mathematician, astronomer, merchant and slave-owner in Kingston, Jamaica. He became a Fellow of the Royal Society in 1747, considered to be an "ingenious and learned mathematician" and "one of the best mathematicians of the age". He was a benefactor of the Macfarlane Observatory at the University of Glasgow, where he bequeathed his instruments on his death in 1755.