James Lonsdale

• James Lonsdale (Irish politician), Unionist member of the British Parliament from Ireland
• James Lonsdale (painter), fashionable and prolific English portrait painter
• James John Lonsdale, English judge, writer and secretary to the Criminal Law Commission
• James Lowther, [1st Earl of Lonsdale], member of the British Parliament from various places in England
• James Lowther, 7th Earl of Lonsdale, British peer