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BTI or Bti may refer to:

  • Bacillus thuringiensis israelensis (Bti), a bacterium
  • Barisan Tani Indonesia, the Indonesian farmers movement; see Peasants Front of Indonesia
  • Baron Tornado Index, a measure of the probability of a tornado inside a Tornadic Vortex Signature
  • Beverage Testing Institute
  • Blistein Teachers Institute of Hebrew Theological College in Skokie, Illinois
  • Boston Theological Institute
  • Boyce Thompson Institute for Plant Research, a research institute of Cornell University (Ithaca, New York)
  • Btrieve Technologies, Inc.
  • Bicycle Technologies International, a global distributor of bicycle components and accessories based in Santa Fe, New Mexico
Codes and symbols
  • Barter Island LRRS Airport (IATA airport code: BTI) on Barter Island in Alaska, United States
  • British American Tobacco PLC (American Stock Exchange symbol: BTI)