Sentinel may refer to:

• 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 Mesa, in Monument Valley
• 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
• Sentinel Rock

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

• Sentinel (sculpture), a 2000 sculpture by Tim Tolkien
• Sentinels (Hudson), a 2005 public artwork by American artist Jon Barlow Hudson
• The Sentinel (Centralia, Washington statue), a 1924 bronze sculpture by Alonzo Victor Lewis
• The Sentinel, a 2003 steel sculpture by Albert Paley on the campus of the Rochester Institute of Technology

• Sentinel (comic book), a comic book series

• 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
• The Sentinels, antagonistic dinosaur robots from the animated web series Murder Drones
• The Sentinels, a fictional football team from the movie The Replacements (film)

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

• 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

• Gundam Sentinel, a 1987 serial "photo-novel"
• Sentinels novels, a series of novels by Van Allen Plexico
• The Sentinel (collection), 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

• Sentinel (band), an American indie dream rock duo
• Sentinel (electronic music group), Australian electronic dance music group
• Sentinel Sound, a reggae and dancehall sound system from Stuttgart, Germany

• Sentinel (album), a 1979 album by Nigel Mazlyn Jones
• "Sentinel" (instrumental), by Mike Oldfield
• The Sentinel (album), an album by Pallas

• "Sentinel", a song by Alice Cooper on his album Dragontown
• "Sentinel", a song by At The Throne of Judgment on their album The Arcanum Order
• "Sentinel", a song by Hilltop Hoods on their album The Calling
• "Sentinel", a song by VNV Nation on their album Of Faith, Power and Glory
• "Sentinel", a song by Within the Ruins on the album Phenomena
• "The Sentinel", a song by Car Bomb on the album w^w^^w^w
• "The Sentinel", a song by Celldweller on the album Soundtrack for the Voices in My Head Vol. 2
• "The Sentinel", a song by Judas Priest on their album Defenders of the Faith
• "Sentinels", a song by Green Carnation on the album Leaves of Yesteryear
• "Sentinels", a song by Xerath on the album III

• Sentinel (newspaper), a list of newspapers called Sentinel
• Christian Science Sentinel (originally The Christian Science Weekly), an American magazine
• CTC Sentinel
• The Sentinel (India), published in Guwahati, 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

• 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

• Sentinel (publisher), a book publisher
• Sentinel (revolver), a brand of gun made by High Standard Manufacturing Company
• Sentinel, a brand name for the drug cenegermin
• Sentinel Offender Services, a for-profit probation company
• Sentinel Sound, a reggae and dancehall sound system from Stuttgart, Germany
• SentinelOne, a cybersecurity company based in Mountain View, California

• Sentinel Building (disambiguation), multiple buildings with this name
• Sentinel Secondary School, a school in West Vancouver, British Columbia
• The Sentinels, two residential block towers in Birmingham, UK

• Sentinel (FBI), an FBI software project replacing the failed Virtual Case File
• Sentinel value, a flag value used to terminate a loop, a variable length list, or other analogous purpose

• AN/GSQ-272 Sentinel, a United States Air Force weapons system
• LGM-35 Sentinel, an American intercontinental missile under development
• MPQ-64 Sentinel, a radar used by the United States military
• Raytheon Sentinel, an aircraft used by the Royal Air Force
• RQ-170 Sentinel, USAF stealth drone officially acknowledged in early December 2009
• Sentinel tank, an Australian-built World War II Cruiser Tank
• Sentinel-class cutter, a Fast Response Cutter with the United States Coast Guard
• Sentinels, some members of the 3rd U.S. Infantry Regiment
• Stinson L-5 Sentinel, a World War II era American liaison aircraft
• Sentinel 2, a variant of the Terrex ICV armoured personnel carrier

• Sentinel (satellite), GMES Sentinel satellites, series of ESA funded Earth Observation satellites
• Sentinel (space telescope), a proposed (but cancelled) asteroid-hunting infrared telescope by the B612 Foundation
• Animal sentinels, animals which give early indications to environmental hazards
• Sentinel lymph node, the first lymph node affected by a metastasising cancer
• The Sentinel series, a series of US radioisotope thermoelectric generators

• 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

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

• Sentinel (horse)

• Sentry (disambiguation)
• Watchman (disambiguation)
• Guard (disambiguation)
• Sentinel Project (disambiguation)
• Centinela (disambiguation)
• Sentinelle
• La Sentinelle (disambiguation)
• Sentinelese, an ethnic group on North Sentinel Island