Hartog is a surname. It may refer to:
- Hartog
- Ashley Hartog - South African soccer player
- Dirk Hartog (1580-1621) - Dutch sea captain and explorer
- Simon Hartog - British filmmaker
- Wil Hartog - Dutch motorcycle racer
- De Hartog
- Jan de Hartog (1914-2002) - Dutch expatriate writer in England and the United States
- Den Hartog
- Arie den Hartog - Dutch bicycle racer
- Arno den Hartog - Dutch hockey player
- J. P. Den Hartog (1901-1989) - American Timoshenko Medal winner, MIT professor of engineering
- Kristen den Hartog - Canadian writer
- Hartogs
- Friedrich Hartogs (1874-1943) - German mathematician
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- Hartogs number
- Hartogs' lemma
- Hartogs' theorem
- Hartog as a middle name
- Georg Hartog Gerson (1788-1844) - German physician
- Lo Hartog van Banda (1916-2006) - Dutch comics writer
- Madeleine Hartog Bell - Miss World 1967