London Stadium (formerly and also known as the Olympic Stadium and the Stadium at Queen Elizabeth Olympic Park) is a multi-purpose outdoor stadium at Queen Elizabeth Olympic Park in the Stratford district of London. It is located in the Lower Lea Valley, 6 miles (10 km) east of central London. The stadium was constructed specifically for the 2012 Summer Olympics and 2012 Summer Paralympics, serving as the athletics venue and as the site of their opening and closing ceremonies. Following the Games, it was rebuilt for multi-purpose use and now serves primarily as the home of Premier League club West Ham United, who became anchor tenants from the 2016 season. UK athletics are the other tenants in the stadium and host a round of the IAAF Diamond League each year, known as the London Grand Prix, sometimes called the London Anniversary Games.

Land preparation for the stadium began in mid-2007, with the construction officially starting on 22 May 2008. The stadium held 80,000 people for the Olympics and the Paralympic games, before it was remodelled between 2013 and 2015 with 66,000 seats, but with capacity for football limited to 60,000 under the terms of the lease. The decision of what happened to the stadium post Olympics had to be run twice after the first process was delayed by legal cases and a complaint to the European Commission in regards to state aid. It was decided to run a second round of bidding for the stadium, this time keeping it in public ownership and seeking an anchor tenant instead of an owner.

The stadium has been owned and operated by different companies starting with the London Organising Committee of the Olympic and Paralympic Games (LOCOG). In October 2012, the whole park including the stadium was handed over to the London Legacy Development Corporation (LLDC) who set up a subsidiary company with Newham Council known as E20 Stadium LLP in July 2012 to oversee the stadium. In 2015, Vinci SA were appointed to manage the Stadium for a 25-year period through London Stadium 185. Newham Council left the E20 Stadium partnership in 2017 and their stake was taken by the LLDC. The LLDC bought LS185 from Vinci in 2019. In January 2025 the LLDC relinquished their interest in E20 Stadium LLP and LS185 to GLA Holdings Ltd. E20 Stadium LLP was renamed London Stadium LLP on 3 April 2025.

The stadium during the Olympic and Paralympic Games was owned by the London Organising Committee of the Olympic and Paralympic Games (LOCOG) and the Olympic Delivery Authority.

Following the collapse of the first deal for the stadium over state aid and the wish to keep the stadium in public ownership; the London Borough of Newham withdrew from the West Ham bid and intended to contribute to the funding of the Stadium with the OPLC. It was decided that a Special-purpose vehicle (SPV) would be created which the £40m, from the first tender process would be invested through a subsidiary company called Newham Legacy Investments (NLI). Accounting firms concluded that a limited liability partnership (LLP) was the most appropriate structure for the SPV. In October 2012 the whole park including the stadium was handed over to the London Legacy Development Corporation (LLDC); which had replaced the public sector, not-for-profit company limited Olympic Park Legacy Company in April 2012 under the Localism Act 2011 as the responsible body to redevelop the Olympic Park after the Games. The LLDC and Newham Council, set up another subsidiary company known as E20 Stadium LLP in July 2012 to take long term responsibility for managing the Stadium.

In October 2014, The Evening Standard reported that French company Vinci SA were favourites to be given a contract to run the stadium for ten years. The company had reportedly beaten off competition from other companies including Anschutz Entertainment Group. In February 2015, Vinci Stadium, a subsidiary of Vinci Concessions, were appointed to manage it starting in April 2015 for a 25-year period becoming the first stadium outside France to be managed by Vinci. The company is also responsible for the London Marathon Charitable Trust Community Track and events on the south park lawn. Vinci set up a subsidiary company called London Stadium 185 (LS185), with the 185 signifying how many medals were won by British athletes at the London Olympic and Paralympic Games. In January 2019, the LLDC bought LS185 from Vinci after concerns were raised following a £3.5 million loss the previous year, with all staff being retained.

NLI and Newham Council reliquished its stake in E20 Stadium LLP in November 2017. Stratford East London Holdings LTD (SELH), a new subsidiary company of the LLDC, was formed and took over NLI's stake in the partnership. In November 2024 the LLDC voted to hand over their interest in E20 Stadium LLP, as well as subsidaries SELH and LS185, to GLA Holdings Ltd, a subsidiary company of Greater London Authority (GLA). This was completed in January 2025 with E20 Stadium LLP being renamed London Stadium LLP from April 2025. The change was made to simplify and consolidate the ownership structure, removing the need for duplicative administrative requirements, rationalise leadership and enable the stadium to be directly managed by the GLA rather than the LLDC, which has less grant funding to support the stadium's governance.

Great Britain had bid for three successive summer Olympic Games between 1992 and 2000. There had been two failed attempts to bring the Olympic Games to Manchester, and one to Birmingham. The International Olympic Committee (IOC) indicated that if Britain was serious about hosting the Games, then a proposal from London would be the one that the committee would listen to, according to British Olympic Association (BOA) chief executive Simon Clegg. In 1997 the BOA appointed David Luckes to conduct a feasibility study about hosting the games. By 2000 Luckes had come up with two proposals: