Lyn may refer to:
A surname, variant of Lynn
In television and film:
- Euros Lyn, Welsh director for television
- Lyn Ashley, Australian actress who worked in the United Kingdom on television during the 1960s
- Lyn Brown (journalist), African American anchorwoman
- Lyn Collingwood, Australian television and film actress
- Lyn Harding, British actor
- Lyn James, actress
In other fields:
- FC Lyn Oslo, Norwegian football club from Oslo established in 1896
- Lyn, a character from the Fire Emblem series
- Lyn (singer), South Korean singer
- Lyn Brown (politician), British politician
- Lyn Hejinian, United States poet, essayist, translator and publisher
- Lyn locomotive, A Lynton and Barnstable railway locomotive
- Lyn Me, a character in the Star Wars universe
- LyN engine, a video game engine
- Lyn, a soccer field and skating rink at Billingstad, Norway.
In Biochemistry:
- Lyn, a Src-Family Kinase
Inanimate entities:
- Lynx (constellation), standard abbreviation