COL, CoL or col may refer to:

• A geographical col, also known as a mountain pass or saddle
• A meteorological col, a trough of lower air pressure between two high-pressure areas in the weather

In geomorphology, a col is the lowest point on a mountain ridge between two peaks. It may also be called a notch, a gap or a saddle, although the last-named usually has a wider meaning and may contain a mountain pass. Moreover, the term col tends to be associated more with mountain, rather than hill, ranges.

Colonel (abbreviated Col., Col or COL and pronounced , similar to "kernel") is a senior military officer rank below the general officer ranks. However, in some small military forces, such as those of Iceland or the Vatican, colonel is the highest rank. It is also used in some police forces and paramilitary organizations.

compLexity Gaming (coL) is a professional American eSports organization that competes in Heroes of the Storm, Call of Duty, Dota 2, , Heroes of Newerth, StarCraft II and . From 2006 to 2009 they were a franchise of the Championship Gaming Series known as the Los Angeles Complexity. They have previously sponsored players and teams competing in League of Legends, , Dead or Alive 4, Forza Motorsport 2, FIFA 07, and Smite. compLexity was founded by Jason "1" Lake in 2003 as a Counter-Strike 1.6 clan.