• Flag, Arkansas, an unincorporated community
• Flag, Missouri, a ghost town

Fictional entities

• Foundation for Law And Government (FLAG), a fictional law-enforcement foundation in the TV series Knight Rider and sequels

Film and television

• Flag (anime), a 2006 series by Kazuo Terada
• The Flag: A Story Inspired by the Tradition of Betsy Ross, a 1927 silent short film

Music

• Flag (note), a part of a note value in music notation
• Flag, a band formed by former members of punk rock band Black Flag in 2013
• Flag (James Taylor album), 1979
• Flag (Yello album), 1988
• Flags (Brooke Fraser album), a 2010 album by Brooke Fraser
• Flags (Moraz and Bruford album)
• The Flag (album), a 1986 album by Rick James

Paintings

• Flag (painting), a 1954/1955 painting by American artist Jasper Johns
• The Flag (O'Keeffe painting), a 1918 painting by Georgia O'Keeffe

Other media

• Flag (lighting), in film and photography, a device used to block light
• The Flag (novel), a 1965 novel by Robert Shaw

Plants

Flag is the common name of several genera or species of flowering plants:

• Acorus calamus or sweet flag, found in many countries
• Flag iris or just "flag", various species in North America
• Libertia pulchella, or pretty grass-flag, a species native to New Guinea, New Zealand and Australia
• Patersonia or native flag, an Australian plant genus resembling the genus Iris

Other uses in biology and medicine

• FLAG (chemotherapy), a chemotherapy regimen
• FLAG-tag, a unique epitope added to proteins in biochemistry
• Flagging (botany), a growth pattern that reduces or eliminates growth on one side of a tree or other plant

• Flag (computing), a true/false, on/off or open/closed indicator (Boolean variable)
• FLAGS register (computing), a CPU register on x86 systems
• Fiber-Optic Link Around the Globe (FLAG), an undersea fiber optic cable