John E. McCormac is an American Democratic Party politician, who is serving as the Mayor of Woodbridge Township, New Jersey.

Codey, who succeeded McGreevey in November 2004, retained McCormac in the post for his administration.

After leaving the treasurer's office in January 2006, McCormac announced his intention to seek the Democratic nomination for Mayor of Woodbridge in the 2007 election.

He was planning on opposing Mayor Frank Pelzman in the Democratic primary.

Pelzman's unexpected June 2006 death triggered a November 2006 special election where McCormac won; he was sworn in on November 13, 2006 and has held the post ever since; State Senator Joseph Vitale was appointed to serve as mayor until the special election winner was sworn in.