James Hewitt (born 1958) is a British army officer, former lover of Diana, Princess of Wales.

James Hewitt may also refer to:

• James Hewitt, 1st Viscount Lifford (1712–1789), Anglo-Irish lawyer and judge
• James Hewitt, 2nd Viscount Lifford (1750–1830), Anglo-Irish peer and clergyman
• James Hewitt, 4th Viscount Lifford (1811–1887),
• James Hewitt (musician) (1770–1827), composer and conductor
• James Hewitt (Guitarist) (born 1991), Guitarist and Producer
• Jamie Hewitt (cricketer) (born 1976), English cricketer
• Jamie Hewitt (footballer) (born 1968)
• Jim Hewitt (born 1933), Canadian politician

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