Robert Gillies (31 July 1835 – 15 June 1886) was a 19th-century Member of Parliament in Otago, New Zealand. He was born in Rothesay on the Isle of Bute, Scotland. He failed to win the Bruce electorate at the 1883 by-election, and won the seat at the general 1884 election by a majority of 217. He resigned in 1885 for failing health, which caused the 1885 Bruce by-election. He died on 15 June 1886 from an aneurysm of the heart. He was the brother of Thomas Gillies and John Lillie Gillies, and the father of plastic surgeon Harold Gillies. Robert was buried in the Northern Cemetery.