Robert Dundas may refer to:
- Robert Dundas (died 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
- Robert Dundas, 2nd Viscount Melville (1771–1851), Scottish nobleman
- Robert Dundas, 4th Viscount Melville, the third son of Robert Saunders Dundas, 2nd Viscount Melville
- Robert Adam Dundas, known as Robert Adam Christopher
- Robert Lawrence Dundas, British Member of the UK Parliament for Richmond, Malton and East Retford