Sir John Scott Lillie CB (1790 – 29 June 1868) was a decorated officer of the British Army and Portuguese Army who fought in the Peninsular War (1808–1814). He was a landowner, entrepreneur and inventor. He was Deputy Lieutenant of the County of Middlesex and Chairman of the Middlesex Quarter Sessions, a freemason, a radical politician and supporter of the great Irish statesman Daniel O'Connell. He was an early antivivisectionist and writer.