Duilin can refer to:
- Duilin of Gondolin, an elf-lord of the First Age who led the House of the Swallow.
- Duilin (son of Duinhir), a Gondorian solider who lived during the War of the Ring and died in the Battle of the Pelennor Fields.
- The nightingale, or "dusk-singer", which is duilinn in Sindarin.
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