FLT

• Fermat's Last Theorem, in number theory
• Fermat's little theorem, using modular arithmetic
• Finite Legendre transform, in algebra

• Alovudine (fluorothymidine), a pharmaceutical drug
• Fluorothymidine F-18, a radiolabeled pharmaceutical drug

• Finger Lakes Trail, New York, United States
• Flitwick railway station, England
• Phaeton Airport, Haiti

• Fairlight (group), a 1980s Commodore warez group
• Flight Centre, an Australian travel company (founded 1982; ASX ticker:FLT)
• Free Federation of Workers ({{langx|es|Federación Libre de Trabajadores|links=no}}), a 20th-century Puerto Rican trade union
• Liberation Front of Chad ({{langx|fr|Front de Libération du Tchad|links=no}}), 1965–1976
• Luxembourg Tennis Federation (French: {{lang|fr|Fédération Luxembourgeoise de Tennis}}), a sports governing body (founded 1946)

• Flutter-tonguing, in music
• Foreign Language Teaching, in education

• FTL (disambiguation)

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