Line in the sand is an idiom, a metaphorical (sometimes literal) point beyond which no further advance will be accepted or made.

Line(s) in the Sand may also refer to:

• Lines in the Sand (book), a 2007 book by Steve Bickerstaff about the 2003 Texas congressional redistricting
• Line in the sand match, an infamous Australian rules football match in 2004
• Lines in the Sand, a 2003 novel by Rhiannon Lassiter
• A Line in the Sand (TV series), a 2004 British television mini-series
• A Line in the Sand (film), a made-for-TV movie directed by Jeffrey Chernov
• A Line in the Sand (board game), a 1991 board game by TSR
• A Line in the Sand (video game), a 1992 video game by Strategic Simulations based on the board game
• "A Line in the Sand" (Dear America), a 1998 book in the Dear America series