(+)-Menthofuran synthase (EC 1.14.13.104, menthofuran synthase, (+)-pulegone 9-hydroxylase, (+)-MFS, cytochrome P450 menthofuran synthase) is an enzyme with systematic name (+)-pulegone,NADPH:oxygen oxidoreductase (9-hydroxylating).

[1][2] This enzyme catalyses the following chemical reaction Menthofuran synthase is a heme-thiolate protein (P-450).