Hannan may refer to:
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Look up Hannan in Wiktionary, the free dictionary.
- Hannan (surname), a common Irish surname coming from the Gaelic Ó hAnnáin or Ó hAnáin
- Hannan (Arabic: "gracious"), popular first name in Middle-Eastern cultures
- Hannan, Osaka, city in southern Osaka Prefecture, Japan
- Hannan University, a university located to the south of Osaka, Japan
- Hannan District, in Wuhan, Hubei, China
- Hannan Rathorr, in Kashmir