Gilchrist Stanley Maclagan (5 October 1879 – 25 April 1915) was a British rower who competed in the 1908 Summer Olympics.

He set the record of being the only man to be in the winning crew in the Grand Challenge Cup six times.

In 1908, he was cox of the Leander eight, which won the gold medal for Great Britain rowing at the 1908 Summer Olympics.

He was killed in action in Pilckem Ridge, at the Second Battle of Ypres, aged 35, and is commemorated on the Menin Gate.

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