Mountains

• Mount Sentinel, a mountain next to the University of Montana in Missoula, Montana
• Sentinel Buttress, a volcanic crag on James Ross Island, Antarctica
• Sentinel Dome, a naturally occurring granite dome in Yosemite National Park, California
• Sentinel Mountain (Montana), in Glacier National Park
• Sentinel Peak (Alberta)
• Sentinel Peak (Antarctica)
• Sentinel Peak (Arizona), a peak in the Tucson Mountains
• Sentinel Peak (British Columbia)
• Sentinel Range, a mountain range in Antarctica
• The Sentinel, Hout Bay
• The Sentinel (Zion), a sandstone summit in Zion National Park, Utah

Elsewhere

• Sentinel, Arizona
• Sentinel, California
• Sentinel, Missouri
• Sentinel, Oklahoma
• Sentinel Island (disambiguation)

Artworks

• Sentinel (sculpture), a 2000 sculpture by Tim Tolkien
• Sentinels (Hudson), a 2005 public artwork by American artist Jon Barlow Hudson

Comics

• Sentinel (comic book), a comic book series

Characters

• Sentinel (comics), one of a group of mutant-hunting robots in the Marvel Universe
• Sentinel, a paradigm role in Final Fantasy XIII
• Sentinel, a character class in the Mass Effect universe
• Alan Scott, the original Green Lantern, who was called "sentinel" at one point
• Sentinels, a faction in Call of Duty: Advanced Warfare
• Sentinel, a computer in the TV show Transformers: Beast Wars
• Sentinels, one of the two teams in Defense of the Ancients
• Sentinels, a group of super soldiers infected with a variant of the Chimera virus in Resistance 2
• Sentinels, a law enforcement-themed clan in Urban Rivals
• The Sentinel, a boss character in Borderlands: The Pre-Sequel
• The Sentinel, the fictitious military academy attended by Frank Underwood, in the Netflix Originals TV series House of Cards

Films

• The Sentinel (1977 film), a film based on the Jeffrey Konvitz novel
• The Sentinel (1992 film) (La Sentinelle in French), a film by the French director Arnaud Desplechin
• The Sentinel (2006 film), a thriller directed by Clark Johnson starring Michael Douglas

Gaming

• Sentinel (iOS game), a 2010 iOS sci-fi tower defense game
• Sentinel, a 1984 computer game created by Bryan Brandenburg
• Sentinel (1990 video game), a game for the Atari 2600 and 7800 developed by Imagineering
• Sentinel: Descendants in Time, a 2004 computer game published by Detalion
• The Sentinel (module), an adventure module for Dungeons & Dragons
• The Sentinel (video game), a 1986 game created by Geoff Crammond
• Sentinel, a sniper rifle in battle royale game Apex Legends
• Sentinels (esports), an American esports company

Literature

• Gundam Sentinel, a 1987 serial "photo-novel"
• Sentinels novels, a series of novels by Van Allen Plexico
• The Sentinel (anthology), a collection of short stories by Arthur C. Clarke
• The Sentinel (Konvitz novel), a 1974 novel by Jeffrey Konvitz
• "The Sentinel" (short story), a 1951 short story by Arthur C. Clarke
• The Sentinel (Child novel), a 2020 novel by Lee and Andrew Child
• The Sentinels (Carter novel), a 1980 young adult novel by Peter Carter

Music

Periodicals

• Sentinel (newspaper), a list of newspapers called Sentinel
• Christian Science Sentinel (originally The Christian Science Weekly), an American magazine
• CTC Sentinel
• The Sentinel (Guwahati), published in Gauhati, Assam, India
• The Sentinel (KSU), published by Kennesaw State University
• The Sentinel, published by journalism students at Heritage High School
• The Sentinel, published by Melbourne High School

Television

• The Sentinel (TV series), a 1996–1999 Canadian crime drama series
• "The Sentinel" (American Horror Story), a 2022 episode
• "The Sentinel" (Stargate SG-1), a 2002 episode

Locomotives and lorries

• Sentinel Waggon Works, a British engineering firm that produced lorries and locomotives:
  • LMS Sentinels 7160-3
  • LMS Sentinel 7164, a small shunting locomotive
  • LMS Sentinel 7192, a geared steam locomotive
  • S&DJR Sentinels, two small steam locomotives for shunting

Vessels

• Sentinel (steamboat), a small wooden steamboat associated with the Puget Sound Mosquito Fleet