Measurements of stratospheric BrO profiles are reported using a novel DOAS instrument (Differential Optical Absorption Spectrometry) operated on the LPMA/DOAS balloon gondola (LPMA/Laboratoifè de Physique Moléculaire et Applications) during three flights (Leon, Nov. 23, 1996, Kiruna, Feb. 14, 1997, and Gap, June 20, 1997). BrO was detected by its vibrational bands (4-0 at 354.7nm; 5-0 at 348.8 nm) of the A(2π)← X(2π) transition in direct sunlight spectra from balloon ascent, descent and during solar occultation at maximum (float) altitude. We show that our accuracy is about ±18% (1 σ) during balloon ascent (solar zenith angles, SZA < 88°), and about ±25% for solar occultation measurements. For altitudes above the balloon float our observations indicate average BrO mixing ratios of (14.4±2.5)ppt, (15.6±2.8)ppt, and (15.3±2.8)ppt above 30.6km, 30.0km, and 39.8km, respectively.