Cog

A cog is a tooth of a gear or cogwheel or the gear itself.

Cog, COG, CoG, or The Cog may also refer to:

Science and engineering

Cog (ship), a type of sailboat from the 10th century onward
Center of gravity, a spatial point related to an object's center of mass
Cluster of Orthologous Groups of proteins; see Sequence homology and MicrobesOnline
Conserved oligomeric Golgi complex, that includes COG2, COG4, etc.
INSEE code (also code officiel géographique), a numerical indexing code used by the French National Institute for Statistics and Economic Studies
Mount Washington Cog Railway, the world's first mountain-climbing cog railway
OpenCog, a project that aims to build an open source artificial general intelligence framework
Chip on Glass; see Liquid-crystal display

C.O.G., a 2013 American drama
C.O.G. (2025 film), an American science fiction horror film
"The Changing of the Guard" (The Twilight Zone), a 1962 episode of the TV series The Twilight Zone
"Cog" (advertisement), a British television and cinema advertisement launched by Honda
Star Wars Jedi Quest 8: The Changing of the Guard, the eighth book in the Star Wars Jedi Quest series by Jude Watson
"C.O.G." (2025 film), film directed by Tommy Savas

Coalition of Ordered Governments, a fictional organization from the Gears of War series
Cogs, the fictional antagonists in the MMORPG Toontown Online
Cogs, the fictional foot soldiers of Power Rangers' Machine Empire
Cog (comics), a character from the Spawn comics

Canberra Ornithologists Group, an Australian ornithological organization
Church of God (disambiguation), a name used by numerous, mostly unrelated Christian denominational bodies
Council of Government (disambiguation), various government bodies
Council of governments, regional bodies that exist throughout the United States
The ISO 3166-1 alpha-3 country code for Republic of the Congo

Cog (software), an open source audio player for macOS
Cog (project), a project at the Humanoid Robotics Group of the Massachusetts Institute of Technology
Continuity of government, defined procedures that allow a government to continue its essential operations in case of catastrophe
Course over ground, the actual path followed by a vessel from A to B as determined by its course