DBA has several meanings:

• DBA, DrakeBirdAirline (an imaginary airline)
• Dba, a low-cost airline (former Deutsche BA)
• Dallas Bar Association
• Database administrator (or analyst)
• De Bellis Antiquitatis, a tabletop wargame
• Decibels, weighting method "A", expressed as dBA or dB(A). Also called A-Weighted. Further see Bel (acoustics)
• A Design Basis Accident at a nuclear power plant
• Doctor of Business Administration, a terminal degree. See also: Doctorate
• Doing business as, more often as d/b/a
• Dutch Book Argument in Economics
• Dynamic Bandwidth Allocation, a type telecommunications algorithm
• draw by agreement in chess

DBA