Delmar is a surname of Spanish origin, meaning "of the sea". Notable people with the surname include:
- Eugene Delmar (1841-1909), American chess master
- Ferdinand Moritz Delmar (1781 - 1858), Prussian banking baron
- Viña Delmar (1903–1990), American novelist
- Kenny Delmar (1910–1984), American actor
- Elaine Delmar (1939–), British singer
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