Last name Oosthuizen (Oosthuizen 
) , worldwide, is a common cognomen. The family name Oosthuizen is habitual in British Virgin Islands, where it is a common surname, Namibia, where it is quite a common surname, and South Africa. In absolute terms, it is the most numerous in South Africa, Namibia, and Australia.
| VARIANT | COUNTRY |
|---|---|
| Oosthuizen | Australia, United Kingdom, South Africa, Zambia, Namibia |
| marthinus jacobus oosthuizen ZA (b. 1818) |
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| sarel oosthuizen ZA (b. 1862) |
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| roelof oosthuizen cricketer (1894-1947), ZA (b. 1894) |
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gerhardus cornelius oosthuizen South African politician (b. 1957) |
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| d. c. s. oosthuizen South African philosopher (1926-1969), ZA (b. 1926) |
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| gerhardus cornelis oosthuizen (b. 1922) |
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louis oosthuizen professional golfer, ZA (b. 1982) |
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john robert oosthuizen South African javelin thrower, ZA (b. 1987) |
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jason oosthuizen cyclist, ZA (b. 1999) |
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| johan oosthuizen South African rugby union player, ZA (b. 1951) |
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| ockie oosthuizen South African rugby union footballer (1955-2019), ZA (b. 1955) |
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| andries oosthuizen South African professional golfer (born 1954) (b. 1955) |
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| theo oosthuizen South African rugby union footballer, ZA (b. 1964) |
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| chrisna oosthuizen South African athletics competitor, ZA (b. 1971) |
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| riaan oosthuizen South African cricketer, ZA (b. 1972) |
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