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)
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