Mega Disasters is an American documentary television series that originally aired from May 23, 2006 to July 2008 on The History Channel. Produced by Creative Differences, the program explores potential catastrophic threats to individual cities, countries, and the entire globe.

The two "mega-disasters" of the 2004 Indian Ocean tsunami and Hurricane Katrina in 2005 inspired the series and provided a reference point for many of the episodes. Excepting only two shows devoted to man-made disasters, the threats explored can be divided into three general categories: meteorological, geological, and cosmic hazards.