The 2013 Euroleague Final Four was the concluding Final Four tournament of the 2012–13 Euroleague season. It was held from 10 May till 12 May 2013, at The O2 Arena in London. The Greek League club Olympiacos, successfully defended their EuroLeague title from the previous season, after defeating Real Madrid in the Final.

The O2 Arena, commonly known as The O2, is a multi-purpose indoor arena in the centre of The O2 entertainment district on the Greenwich Peninsula in southeast London. It opened in its present form in 2007. It has the second-highest seating capacity of any indoor venue in the United Kingdom, behind the Manchester Arena, and in 2008 was the world's busiest music arena. As of 2022, it is the ninth-largest building in the world by volume with a diameter of 365 metres and a height of 52 metres.