John James McCoy is a fictional character in the television drama Law & Order . He was created by Dick Wolf and Michael S. Chernuchin and portrayed by Sam Waterston from 1994 until the end of the series in 2010. He is the second-longest tenured character on the show (16 seasons), after Lt. Anita Van Buren (17 seasons; portrayed by S. Epatha Merkerson ). He appeared in 368 episodes of Law & Order, four episodes of Law & Order: Special Victims Unit , two episodes of Law & Order: Trial by Jury , two episodes of Homicide: Life on the Street , and the made-for-TV movie Exiled .

Jack McCoy (30 November 1910 – 1 April 1976) was an Australian rules footballer who played with St Kilda in the Victorian Football League (VFL).

Jack E. McCoy (May 28, 1929 – December 29, 2014) was a politician and labor activist.

Jack may refer to:

J.A.C.K. is the third studio album by American pop punk band Forever the Sickest Kids. It is their first release through Fearless Records since their former label, Universal Motown, was shut down, which resulted in the regular Motown became a separate label that still operates as of 2019. It is also the first release not to feature keyboardist Kent Garrison and lead guitarist Marc Stewart. The album was produced by Mike Green and was released on June 25, 2013.