溴酚蓝（3',3",5',5"-四溴酚磺酰酞）是一个酸碱指示剂。

它是无色到淡红色的结晶或淡黄到淡棕色的粉末。溶于稀碱液、醇及氨溶液中时呈蓝色，微溶于水及醚溶液呈黄色，其钠盐溶于水呈蓝色。

Bromophenol blue (3',3",5',5"-tetrabromophenolsulfonphthalein, BPB, albutest) is used as a pH indicator, a color marker, and a dye. It can be prepared by slowly adding excess bromine to a hot solution of phenolsulfonphthalein in glacial acetic acid.