BASI stands for Bureau of Air Safety Investigation (Australia)
BASI stands for Basic Achievement Skills Inventory (achievement test; Pearson Education, Inc.)
BASI stands for British Association of Ski Instructors
BASI stands for Buoyant Aircraft Systems International (Canada)
BASI stands for Business and Social Initiatives (database)
BASI stands for Body Arts and Sciences International (est. 1989)
BASI stands for Business Advisory Services Inc. (Parramatta, Australia)