The FN Five-seven, trademarked as the Five-seveN, is a semi-automatic pistol designed and manufactured by Fabrique Nationale d’Armes de Guerre-Herstal (FN Herstal) in Belgium. The pistol is named for its 5.7-mm (.224 in) bullet diameter, and the trademark capitalization style is intended to emphasize the manufacturer's initials—FN.

The Five-seven pistol was developed in conjunction with the FN P90 personal defense weapon and the FN 5.7×28mm cartridge. The P90 was introduced in 1990, and the Five-seven was introduced in 1998 as a pistol using the same 5.7×28mm ammunition. Developed as a companion pistol to the P90, the Five-seven shares many of its design features: it is a lightweight polymer-based weapon with a large magazine capacity, ambidextrous controls, low recoil, and the ability to penetrate body armor when using certain cartridge types.

Sales of the Five-seven were originally restricted by FN to military and law enforcement customers, but since 2004, the pistol has also been offered to civilian shooters for personal protection, target shooting, and similar uses. Although offered only with sporting ammunition, the Five-seven's introduction to civilian shooters was met with vocal opposition from gun control organizations such as the Brady Campaign, and the pistol has been subject to ongoing controversy in the United States.

FSN may refer to:

Fox Sports Networks (FSN), formerly known as Fox Sports Net, is the collective name for a group of regional sports networks in the United States that are primarily owned and operated by the Fox Entertainment Group division of 21st Century Fox. Each of the networks carry regional broadcasts of sporting events from various professional, collegiate and high school sports teams (with broadcasts typically exclusive to each individual network, although some are shown on multiple FSN networks within a particular team's designated market area), along with regional and national sports discussion, documentary and analysis programs.

Depending on their individual team rights, some Fox Sports Networks maintain overflow feeds available via digital cable, telco and satellite providers in their home markets, which may provide alternate programming when not used to carry game broadcasts that the main feed cannot carry due to scheduling conflicts. Fox Sports Networks is headquartered in Houston, Texas, with master control facilities based in both Houston and Los Angeles; FSN also maintains production facilities at Stage 19 at Universal Studios Florida (which formerly served as home of Nickelodeon Studios until its closure in 2005).