Surname Riddoch (Riddoch 
) , across the world, is a rare family name. The cognomen Riddoch is characteristic of the United Kingdom, where it is a rare surname, Canada, and Australia.
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| Riddoch | Canada, United Kingdom, United States, New Zealand, Australia |
| alexander riddoch Scottish merchant (b. 1745) |
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george riddoch Australian pastoralist and politician (1842-1919), AU (b. 1842) |
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| john riddoch Australian politician (1827-1901), AU (b. 1827) |
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| alexander riddoch Tasmanian politician, GB (b. 1830) |
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george riddoch British neurologist (1888-1947), GB (b. 1888) |
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| dave riddoch association football player (1864-1926), GB (b. 1864) |
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| greg riddoch American baseball player, coach and executive, US (b. 1945) |
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| m. jane riddoch (b. 1948) |
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| lesley riddoch Broadcaster and journalist (b. 1960) |
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| alexander riddoch British artist, died 1842 or 1843 |
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| laura h riddoch researcher |
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| ian riddoch |
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| lindsay riddoch Scottish mental health activist (b. 1993) |
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