John Steven Vaillancourt (December 1, 1951 – March 27, 2017) was an American politician as a Republican member of the New Hampshire House of Representatives.
He represented Hillsborough County District 15, the city of Manchester Ward 8.
He served from 1996-2014 and from 2016 until his death.
He served as a member of the Democratic Party, the Libertarian Party, and later the Republican Party.
Vaillancourt also served as Manchester alderman for Ward 8 from 1999 to 2001 while serving in the State House of Representatives.