Monobutyl phthalate (MBP) is an organic compound with the condensed structural formula CH<sub>3</sub>(CH<sub>2</sub>)<sub>3</sub>OOCC<sub>6</sub>H<sub>4</sub>COOH. It is a white solid that features both an butyl ester group and a carboxylic acid group. It is the major metabolite of dibutyl phthalate. Like many phthalates, MBP has attracted attention as a potential endocrine disruptor.
MBP is also the secondary metabolite of butyl benzyl phthalate, less than monobenzyl phthalate (MBzP). It hydrolyses to phthalic acid and 1-butanol.