Loop

Film

• Loop (1991 film), a British romantic comedy
• Loop (1998 film), a Venezuelan film
• Loop (2020 film), an American animated short
• Film loop, the slack portion of the film around the projector lens in a movie projector
• Porn loop, an 8 or 16 mm film "short" of a pornographic nature

Music

Roller coasters

• Loop (roller coaster), a basic roller coaster inversion
• Pretzel loop, a roller coaster element

Other uses in arts, entertainment, and media

• Loop (novel), a novel in the Ring series by Koji Suzuki
• LOOP Barcelona, an annual event for video art in Barcelona, Spain

Populated places

• Loop, Germany, a municipality in Schleswig-Holstein
• Loop, Blair County, Pennsylvania, United States, an unincorporated community
• Loop, Indiana County, Pennsylvania, United States, an unincorporated community
• Loop, Texas, United States, a census-designated place
• Loop, West Virginia, United States, an unincorporated community
• Chicago Loop, the downtown neighborhood of Chicago bounded by the elevated railway The Loop
  • Loop Retail Historic District, a shopping district in the Chicago Loop
• Delmar Loop, an entertainment district in St. Louis, Missouri

Other places

• Louisiana Offshore Oil Port, a deep-water port in the Gulf of Mexico off the coast of Louisiana

Mathematics

• Loop (algebra), a quasigroup with an identity element
• Loop (graph theory), an edge that begins and ends on the same vertex
• Loop (topology), a path that starts and ends at the same point, possibly reduced to a single point

Programming and software

• Loop (statement), a method of control flow in computer science
• LOOP (programming language), a simple register language capturing exactly the primitive recursive functions via bounded loops
• Loop device, a Unix device node that allows a file to be mounted as if it were a device
• LOOPS, the object system for Interlisp-D
• Microsoft Loop, collaborative software
• Loops (social network), a project from Pixelfed to bring Tiktok-like social media to the Fediverse

Other uses in electronics

• Loop (telecommunication) or loopback, sending a signal on a channel and receiving it back at the sending terminal
• Audio induction loop, an aid for the hard of hearing
• Local loop, the physical link in telephony that links the customer premises to the telephone company
• Control loop, a fundamental component of control systems

Other uses in science and technology

• Loop (biochemistry), a flexible region in a protein's secondary structure
• Control loop, a fundamental component of control systems
• Ground loop (aviation), a rapid horizontal (yawing) rotation of a fixed-wing aircraft used in emergencies to bleed off energy while landing
• Loop, a type of fingerprint pattern

Rail

• Loop line (railway), a branch line that deviates from a direct route and rejoins it at another location
• Balloon loop, a section of rail track that allows reversal of direction without stopping
• Passing loop, a short section of track that allows trains to pass on a single track route
• Circle route, a public transport route that travels around and connects the peripheral zones of an area
• Spiral (railway), a section of track that allows a train to climb a steep hill
• Loop (Amtrak train), a discontinued Amtrak train
• The Loop (CTA), a rapid transit section bounding Chicago's Loop neighborhood

Road