Lannon is a surname. Notable people with that name include:
- Frances Lannon (born 1945), British historian
- James Patrick Lannon (1878-1953), American admiral
- Nyles Lannon, American musician
- Ryan Lannon (born 1982), American ice hockey player
- Timothy R. Lannon (born 1952), American university president
Fictional
- Alex Lannon, character in Dominion
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