F81 can refer to:
- A number of naval warships; including:
SPS Santa María (F81 is the lead ship of six Spanish-built Frigates based on the USN ''Oliver Hazard Perry'' (FFG-7 design Affiliations The Highlanders, 4th Battalion Royal Regiment of Scotland No A substitution model describes the process from which a sequence of characters of a fixed size from some Alphabet changes into another set of traits
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