Flannan may refer to:
- Flannán mac Toirrdelbaig, saint and patron of Killaloe
- Flannan Isles, a small island group in the Outer Hebrides of Scotland
- Flannan Isles Lighthouse, lighthouse on Eilean Mòr, one of the Flannan Isles
- St Flannan's College, Irish secondary school
- Flannan Isle, poem by Wilfrid Wilson Gibson
This disambiguation page lists articles associated with the title Flannan.
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