Fionn (Irish: [fʲiːn̪ˠ], Scottish Gaelic: [fjũːn̪ˠ]) is a masculine given name in Irish and Scottish Gaelic. In English, it is pronounced "Finn" (/fɪn/ FIN) or "Fyun". It is derived from a byname meaning "white" or "fair-haired". It is the original version of a name later anglicized as Find and Finn. Notable people with the name include:

• Fionn Carr, Irish rugby union player
• Fionn Fitzgerald, Irish football player
• Fionn MacColla, Scottish novelist
• Fionn mac Cumhaill, figure from Irish mythology
• Fionn McLoughlin, Irish rugby union player
• Fionn O'Shea, Irish actor
• Fionn Regan, Irish folk musician
• Fionn Whitehead, English actor