The invention relates to a flavoring composition having a better milk-like flavor and a process for producing the composition. The composition comprises a 5-alkenoic acid and/or a 6-alkenoic acid both represented by general formula (1) and a lower aliphatic aldehyde having not greater than 8 carbon atoms: ##STR00001## wherein n is an integer of from 1 to 4, and the dashed line represents the presence of a carbon-carbon double bond at either side. The composition may further comprise a .delta.-lactone represented by general formula (2) and/or a .gamma.-lactone represented by general formula (3): ##STR00002## wherein n is an integer of from 1 to 4; and ##STR00003## wherein n is an integer of from 1 to 4.