Grepp is a surname. Notable people with the surname include:
- Gerda Grepp (1907–1940), Norwegian translator, journalist, and socialist
- Kyrre Grepp (1879–1922), Norwegian politician
- Lotte Grepp Knutsen (born 1973), Norwegian politician
- Michael Grepp (born 1985), American singer-songwriter
- Rachel Grepp (1879–1961), Norwegian journalist and politician
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