FRN may refer to:

• Fearn railway station (UK station code: FRN)
• Federal Reserve Note
• Floating rate note
• Forum pour la Redressement National, see Politics of Comoros
• French language, (SIL code: FRN)
• Friendly's, (AMEX ticker symbol: FRN)
• Fucking Rail Nut, a derogatory term used by some railway employees to describe a railfan
• Federal Republic of Nigeria
• Friday Recent News
• National Renaissance Front
• National Reconstruction Front, Haitian political party

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