Robert Dundas may refer to: Robert Dundas, Lord Arniston (1650–1726), Scottish judge and politician Robert Dundas of Arniston, the Elder (1685–1753), his son, Scottish judge Robert Dundas of Arniston, the younger (1713–1787), Scottish judge Robert Dundas of Arniston (1758–1819), Scottish judge Sir Robert Dundas, 1st Baronet (1761–1835), Scottish landowner and lawyer Robert Dundas, 2nd Viscount Melville (1771–1851), Scottish nobleman Robert Dundas, 4th Viscount Melville, Scottish nobleman Robert Nisbet-Hamilton (1804–1877), known as Robert Dundas until 1835, British Conservative Party politician Sir Robert Dundas (British Army officer, born 1780) (1780–1844), British Army officer and politician Robert Dundas, 9th Viscount Melville (1937–2011), British Army officer RFA Robert Dundas, a ship of the Royal Fleet Auxiliary