Sir Ian may refer to:
Sir Ian Anstruther, writer Sir Ian Blair, Head of the Metropolitan Police Service Sir Ian Botham, cricketer Sir Ian Campbell-Gray, soldier Sir Ian Hamilton, general Sir Ian Holm, actor Sir Ian Kennedy, lawyer Sir Ian Kershaw, historian Sir Ian Lloyd, politician Sir Ian McKellen, actor Sir Ian McLennan, businessman Sir Ian Malcolm, politician Sir Ian Potter, businessman Sir Ian Wrigglesworth, politician