FLN may refer to:

• One of a number of organisations named National Liberation Front
• The National Liberation Front (Algeria)
• The National Liberation Front (Burundi)
• The IATA Airport Code for Hercílio Luz International Airport in Florianópolis, Brazil
• The Family Life Network Religious Radio Network based in Bath, NY.
• FLN, a cable/satellite television network from Scripps, which uses the abbreviations for Fine Living Network
• Flint (Amtrak station), Michigan, United States; Amtrak station code FLN.
• Fixed Line telephone Number as against a mobile number

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