Sir Ian Leslie Orr-Ewing (4 June 1893 – 27 April 1958) was a British Conservative Party politician.

Orr-Ewing was born in Ayr, Scotland, the son of Charles Orr-Ewing, Member of Parliament (MP) for Ayr Burghs. He contested Gateshead in 1929. He was elected as Member of Parliament (MP) for Weston-super-Mare in the 1934 by-election after the resignation of Lord Erskine. He served as an MP until his death in April 1958, aged 64.

Orr-Ewing was knighted in the 1953 New Year Honours.

• Times Guide to the House of Commons, Times Newspapers Limited, 1935
• Leigh Rayment's Peerage Pages ^{[self-published source] [better source needed]}