This is a list of megaprojects, which may be defined as projects that cost more than US$1 billion and attract a large amount of public attention because of their effects on communities, the natural and built environment, and budgets; or more simply "initiatives that are physical, very expensive, and public".

Megaprojects can be found in many fields of human endeavor, including bridges, tunnels, highways, railways, hospitals, airports, seaports, power plants, dams, wastewater projects, Special Economic Zones (SEZ), oil and natural gas extraction projects, public buildings, information technology systems, aerospace projects, and military weapons. The following lists are far from comprehensive.

Legend Terms used in the Status column Status color Proposed In Planning, Approved, Under/In Development, Under Construction, Re-Construction In Progress, Nearly Complete On Hold Abandoned, Cancelled Completed

Aerospace projects Project Companies Location Proposal year Status End year Cost Notes Ref A-7 Corsair II Ling-Temco-Vought United States 1963 1984 A single-seat carrier-capable subsonic attack fighter used by the U.S. Air Force and U.S. Navy in the 1960s to 1990s. A derivative of the Vought F-8 Crusader, it saw heavy use in battle in Southeast Asia in addition to its subsequent use in later conflicts such as the Gulf War.LTV A-7 Corsair II $2.86 million light attack aircraft as of 1967 Airbus A380 Airbus 2003 2021 US$25 billion A double-deck, wide-body, four-engine jet airliner. Antonov An-225 Antonov 1988 2022 This was the longest and heaviest aircraft in service until it was destroyed during the Russian-Ukrainian conflict. Only one was completed. B-1 Lancer Rockwell International United States 1980s A supersonic bomber with a variable-sweep wing built in the 1980s as a strategic bomber. It has since acquired conventional and multi-role capabilities. B-2 Spirit Northrop Grumman United States 1987 2000 A US heavy bomber with "low observable" stealth. Total program cost including development, engineering, and testing averaged $2.1 billion per aircraft in 1997. "B-2 Bomber: Cost and Operational Issues Letter Report, 14 August 1997, GAO/NSIAD-97-181". United States General Accounting Office (GAO). Retrieved: 13 September 2009. B-29 Superfortress Boeing United States 1943 1946 US$3 billion The first nuclear bomber cost 50% more to develop than the bombs in the Manhattan Project. B-52 Stratofortress Boeing United States 1952 1963 One of the largest military aircraft ever built. In service since 1955, with decades more planned. All subsequent U.S. bombers have also been megaprojects. B-58 Hustler Convair United States 1960 1970 An all-weather, high altitude supersonic bomber with a fixed delta wing and 4 engines. The Hustler was operational from 1960 to 1970 in the US Air Force's Strategic Air Command for the deployment of up to 5 gravity nuclear weapons. Boeing 2707 and Lockheed L-2000 supersonic aircraft Lockheed, Boeing, US Department of Defense United States 1963 1971 A U.S. government competition to build the first U.S. supersonic transport (SST) was canceled before prototypes were built for political, environmental and economic reasons. Boeing 747 Boeing 1970 2023 A wide-body commercial airliner first produced in 1970, often referred to by the nickname Jumbo Jet, is among the world's most recognizable aircraft with uses for long-distance passenger transport, cargo, the US President's official shuttle plane, and as NASA's Shuttle Carrier Aircraft. Boeing 787 Boeing United States 2007 Ongoing Made with local and globally sourced parts; the first major aircraft to be made largely out of composite materials. C-5 Galaxy Lockheed United States 1961 1969 Over $1 billion The largest and heaviest aircraft of any kind for over a decade (1970 to 1982). This military cargo plane was the first development program with a billion dollar cost overrun. Irving, Clive. Wide Body: The Triumph of the 747. New York: W. Morrow, 1993. , pp. 189–190.Garwood, Darrell. "Newest Air Force planes grounded". Times-News, 17 January 1970. Concorde Aérospatiale, British Aircraft Corporation United Kingdom, France 1965 1979 A product of an Anglo-French government treaty, the supersonic passenger airliner Concorde entered service in 1976 and continued commercial flights for twenty-seven years. F-22 Raptor Lockheed Martin United States 1996 2011 A single seat, twin-engine fifth-generation fighter that uses stealth technology. F-35 Lightning II Lockheed Martin United States 2006 Ongoing US$2 trillion A single seat, single engine, all-weather stealth multirole combat aircraft that is intended to perform both air superiority and strike missions. $2 trillion cost is from 2000 to 2088. KH-11 Kennen Lockheed United States 1976 1990 Reconnaissance satellite. Sukhoi Su-57 Sukhoi Russia A fifth-generation stealth fighter jointly developed for the Russian Air Force. Indian Air Force cancelled its order. TF Kaan Turkish Aerospace Industries Turkey 2011 2030s $20 billion A stealthy, twin-engine, all-weather air superiority fighter, classified as a fifth-generation fighter. Tupolev Tu-144 Tupolev Soviet Union 1968 The first supersonic transport aircraft. First flown on 31 Dec 1968; entered service on 26 Dec 1975. Tupolev Tu-160 Tupolev Soviet Union The largest combat aircraft, supersonic aircraft, and variable-sweep aircraft ever built.

Disaster cleanup

While most megaprojects are planned and undertaken with careful forethought, some are undertaken out of necessity after a natural disaster occurs. There have also been a few human-made disasters. Major restoration was necessary after the destruction caused by World War I and II, some of which was paid for by German reparations for World War I and for World War II. Project Location Disaster Disaster year Status Completion year Cost Notes Ref Great Mississippi Flood relief Mississippi Delta region Great Mississippi Flood of 1927 1927 $246 million to $1 billion $4.2–$17.3 billion in 2023 dollars Mount St. Helens eruption cleanup Washington state, U.S. 1980 eruption of Mount St. Helens 1980 $1.1 billion Chernobyl New Safe Confinement Chernobyl, Ukraine Chernobyl disaster 1986 2019 €2.15 billion The New Safe Confinement accounts for €1.5 billion, with the remainder going to related remedial work and maintenance. Exxon Valdez oil spill Prince William Sound Exxon Valdez oil spill 1989 Over $2 billion Northridge earthquake disaster relief Los Angeles, U.S. 1994 Northridge earthquake 1994 $13–50 billion AZF chemical factory explosion cleanup Toulouse, France Toulouse chemical factory explosion 2001 €2 billion Humanitarian response to the 2004 Indian Ocean earthquake Indian Ocean coastline areas 2004 Indian Ocean earthquake and tsunami 2004 US$6.25 billion Hurricane Katrina disaster relief Atlantic basin countries Hurricane Katrina 2005 $190 billion Deepwater Horizon cleanup Gulf of Mexico Deepwater Horizon oil spill 2010 $65 billion Fukushima disaster cleanup Fukushima, Japan Fukushima Daiichi nuclear disaster 2011 US$187 billion Cost includes compensation, decontamination, interim storage, and decommissioning of reactors. Tōhoku earthquake and tsunami disaster relief Pacific Rim 2011 Tōhoku earthquake and tsunami 2011 US$360 billion Cost includes Fukushima disaster cleanup and economic losses.

Energy projects