Zero Hour (stylized as ZERØ HØUR) is an American conspiracy television series, created by Paul Scheuring and starring Anthony Edwards. In the U.S., the pilot episode became available on Hulu Plus as of February 1, 2013, then the series began airing on ABC on February 14, 2013, as a midseason replacement. On March 1, after the third episode, ABC canceled the series due to low ratings and immediately removed it from the schedule. On April 26, 2013, it was announced that the remaining episodes would be burned off through the dead of summer, beginning with two episodes on June 15 and ending on August 3, 2013.

Zero Hour aired in Canada (but was filmed in both Montreal and New York City) on the Global Television Network for the first three episodes until ABC canceled it, later running the remaining episodes through the summer. Zero Hour aired via the Fox network in Italy, Spain and the Danish Broadcasting Corporation. Zero Hour was announced in 2012 as due to air in Australia on the Seven Network in 2013, but did not premiere until July 13, 2015, in an overnight timeslot, starting at 11:30 p.m.