TKN most commonly refers to
Total Kjeldahl Nitrogen, the sum of nitrogen bound in organic substances, ammonia, and ammonium in the chemical analysis of soil, water, or waste water.
TKN, Tkn or tkn can also refer to:
*
TKN F.C., Thang Kiang Nam a Malaysian football club
*
TKN (song), a song by Spanish singer Rosalía and American rapper Travis Scott
* National Transportation Knowledge Network, a service of the United States
National Transportation Library
*
Takanelite, a mineral (symbol: Tkn) (see )
*
Tankuppa, a railway station in India (station code: TKN) (see )
* Taokaenoi Food & Marketing (stock ticker symbol: TKN), manufacturers of
Tao Kae Noi, a crispy seaweed snack product
*
Tokunoshima Airport, Kagoshima Prefecture, Japan (IATA code: TKN)
*
Tokunoshima language
The Tokunoshima language ( ''Shimaguchi'' or ''Shimayumiita''), also Toku-no-Shima, is a dialect cluster spoken on Tokunoshima, Kagoshima Prefecture of southwestern Japan. It is part of the Amami–Okinawan languages, which are part of the Jap ...
(ISO:639-3 code: tkn), a dialect cluster spoken on Tokunoshima, Kagoshima Prefecture, Japan.
*
Trade Knowledge Network, a collaboration of research institutions in Africa, Asia, Europe and the Americas.
{{Disambig cleanup, date=June 2025