KN or kn may refer to:

Companies

• Kia (2021 logo often misread as KN), a South Korean multinational automobile manufacturer
• Kieler Nachrichten, the only German-language newspaper published in Kiel, Germany
• Kuehne + Nagel, a global transport and logistics company
• K&N Engineering, manufacturer of car parts and consumables

Language

• Kannada (ISO 639-1 code), a Dravidian language
• ⟨kn⟩, the Latin-script digraph used in English to write the word-initial sound /n/

Science

• Complete graph (K_n), a simple undirected graph in which every pair of distinct vertices is connected by a unique edge
• Kilonewton (kN), a common expression of forces measured in newtons (N)
• Knot (unit), a unit of speed equal to one nautical mile per hour
• Knudsen number (Kn), a dimensionless number

Other uses

• .kn, the Internet country code top-level domain for Saint Kitts and Nevis
• Croatian kuna (kn), the currency of Croatia from 30 May 1994 until 31 December 2022
• Saint Kitts and Nevis (ISO 3166 code), an island country and microstate
• Kitchen Nightmares, an American reality television series
  • Ramsay's Kitchen Nightmares, the original British version of the show
    • Various other international editions: see Ramsay's Kitchen Nightmares & International versions