UV absorption cross-sections for cis-BrONO in the gas phase have been measured over the wavelength range 100-365 nm. Absorption measurements were made following cw photolysis of Br-2 in Br-2/NO2/N-2 mixtures in a 100 cm long temperature-regulated absorption cell. The cis-BrONO absorption spectrum shows two maxima in this wavelength range: at 228 nm (2.7 X 10(-18) cm(2) molecule(-1)) and 316 (0.41 x 10(-18) cm(2) molecule(-1)), cis-BrONO absorption cross-sections were determined relative to BrNO2.