John DiMaio (born November 27, 1955) is an American Republican Party politician. He has been serving as a member of the New Jersey General Assembly from the 23rd legislative district since 2009, serving as minority leader since January 2022. Previously he was co-conference leader from 2019 to 2021 and budget officer from 2018 to 2019.
First elected to public office at age 23, DiMaio was a Hackettstown councilman from 1980 to 1990, mayor from 1991 to 1999, and president of the NJ. Conference of Mayors in 1999. He was also a Warren County freeholder from 2000 to 2009, serving as director twice. He is also the owner of A. DiMaio and Son Inc., a general contracting business.
A lifelong resident of Hackettstown, DiMaio and his wife have two daughters.
