The Sziget Festival (pronounced [ˈsiɡɛt]) in Budapest, Hungary is one of the largest music and cultural festivals in Europe. It is held every August on the Northern Budapest Óbudai-sziget ("Old Buda Island"), a leafy island of 108 hectares (266 acres) on the Danube. Sziget stands for Island. Currently it holds more than 1000 performances each year.

The week-long festival has grown from a relatively low-profile student event in 1993 to become one of the largest European rock festivals, with about half of all visitors coming from outside Hungary, particularly the UK and France. It also has a dedicated "party train" service (with resident DJ's) that transports festivalgoers from Western Europe. The second event (1994), labeled Eurowoodstock, was headlined by performers from the original Woodstock festival. By 1997 total attendance surpassed the 250,000 mark, reaching an all-time peak year in 2009 with 390,000 visitors (the full 70,000 capacity being reached on one day). It is now being increasingly labeled as a European alternative to the Burning Man festival due to its unique features ("an electronically amplified, warped amusement park that has nothing to do with reality").

In 2011, Sziget was ranked one of the 5 best festivals in Europe by The Independent, and one of the 10 best by the European Festival Awards.