BTL
- BACnet Testing Laboratories
- Bachelor of Talmudic Law
- Battle Creek (Amtrak station)
- Belize Telecommunications Limited
- Bell Telephone Laboratories
- Below the line (disambiguation)
- Between the Lines Books
- Biomass to liquid
- Bridge-tied load
- Buy-to-let
- McCoy's (crisp)
- Schönefeld (bei Berlin) station
- W. K. Kellogg Airport