T. H. White's use of the wizard as a character in his work, The Once and Future King

The Book of Merlyn, the "lost" fifth book of The Once and Future King

Merlin 8 & 16, an assembler for Apple II computers

Merlin,a Puerto Rican rock band

Rolls-Royce Merlin, an engine for aircraft

Another name for the military helicopter AgustaWestland EH101

MERLIN reactor (Germany); see Jülich Research Centre

Swearingen Merlin, a pressurized twin turboprop airplane

Merlin (film), a television miniseries based on Arthurian legend

Merlin (bird), the bird of prey

MERLIN, the Multi-Element Radio Linked Interferometer Network in the UK

Merlin (The Chronicles of Amber), a character in the Roger Zelazny series

AT&T Merlin, a brand name of an office telephone system

Philippe-Antoine Merlin de Douai (1754 – 1838) a French Revolution-era politician and general

Merlin Entertainments the owner of Tussauds, Legoland, the London Eye and many more attractions

Merlin (protein), a protein involved in Neurofibromatosis type 2

Merlyn (Marvel Comics), a supporting character of Marvel Comics' Captain Britain

Merlyn (DC Comics), a DC Comics supervillain and arch-rival of Green Arrow

Merlin (musical), a 1983 Broadway musical

Merlin the Magician (comics), a Quality Comics superhero character, a descendant of the Arthurian wizard

Merlin Gerin, French electrical power distribution products owned by the Schneider Electric

Merlin (rocket engine), made by the commercial space transportation company SpaceX

Merlin Tonto, a computer sold in 1985

Laurent Merlin, French youth, international footballer.

Dino Merlin (born 1962), a Bosnian singer

Merlin (Marvel Comics), the name of several characters in Marvel Comics

Merlin (Shrek), a Shrek character based on the legendary wizard

Merlin, a medieval poem by Robert de Boron

Arthur-Merlin protocol, an interactive proof system in computer science

Merlin (Disney), a Disney character based on the legendary wizard

Merlin (game), a handheld electronic game by Parker Brothers

Antoine Christophe Merlin (1762 – 1833), a French Revolution-era politician, often called "Merlin de Thionville"

Merlin (project management software), the project-management application for Mac OS X

Merlin Airways, an American airline based in San Antonio, Texas

Aerocomp Merlin, an ultralight airplane

Merlin, Ontario, a community in Chatham-Kent, Ontario

Merlin (bicycles), a manufacturer of custom bicycles in Chattanooga, Tennessee, USA

Merlin, Oregon, a place in Josephine County, Oregon

Merlin diamond mine, Northern Territory, Australia

Merlin Bronques, a Canadian musician

Merlin (charity) (Medical Emergency Relief International), a humanitarian aid charity based in the United Kingdom

Merlin (literary magazine)

2598 Merlin, an asteroid

Merlin Express, an American airline based in Aguadilla, Puerto Rico

Sidney Merlin (1856 – 1952), a British shooter who competed in the first modern Olympics.

Merlin (video game), a game for the Game Boy Color developed by RFX Interactive

MERLIN reactor (UK)

John Joseph Merlin (1735-1803), Belgian inventor associated with Cox's timepiece. He also invented inline skates in 1759.

Merlin, a section of the Lancelot-Grail cycle and the Post-Vulgate Cycle