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 Member of Parliament (MP) for Weston until his death in 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]
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| Member of Parliament for Weston-super-Mare
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