PBE

PBE may refer to:
 * Population balance equation
 * Potential buoyant energy or convective available potential energy (CAPE)
 * Programming by example, in computing
 * Password-based encryption
 * Protective Breathing Equipment, smoke hoods on aircraft
 * Phi Beta Epsilon, an MIT fraternity
 * Prosopography of the Byzantine Empire
 * Prosopography of the Byzantine Empire