Surname Ostergaard (Ostergaard 
) , worldwide, is quite a rare cognomen. The cognomen Ostergaard is habitual in Denmark, where it is quite a common surname, Romania, where it is quite a rare surname, and Finland. In absolute terms, the name is most common in Denmark, the United States, and Romania.
| VARIANT | COUNTRY |
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| Ostergaard | Romania, Denmark, Canada, Finland, United States |
Østergaard, and Остергаард
| kristian ostergaard American pastor, US (b. 1855) |
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| erling ostergaard (b. 1907) |
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| geoffrey ostergaard British political scientist (1926–1990) (b. 1926) |
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| martha j. ostergaard (b. 1923) |
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| solveig ostergaard ballet dancer 1939— (b. 1939) |
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| dan ostergaard chess player (b. 1965) |
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| jens ostergaard chess player (b. 1968) |
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| bjorn ostergaard (b. 1963) |
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| john r ostergaard researcher (ORCID 0000-0002-3906-0831) |
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| k. ostergaard researcher |
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| karen ostergaard researcher |
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| mathias ostergaard researcher ORCID ID = 0000-0003-3402-1232 |
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| misty ostergaard Ph.D. Kansas State University 2016 |
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| karen ostergaard |
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| henrik ostergaard |
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