The Olympiastadion (German pronunciation: [oˈlʏmpi̯aˌʃtaːdi̯ɔn] ), also known in English as the Berlin Olympic Stadium or simply the Olympic Stadium, is a sports stadium at Olympiapark Berlin in Berlin, Germany. It was originally designed by Werner March for the 1936 Summer Olympics. During the Olympics, the record attendance was thought to be over 100,000.

Since renovations in 2004, the Olympiastadion has a permanent capacity of 74,475 seats and is the largest stadium in Germany for international football matches. The Olympiastadion is a UEFA category four stadium.

Besides its use as an athletics stadium, the arena has built a footballing tradition. Since 1963, it has been the home of the Hertha BSC. It hosted three matches in the 1974 FIFA World Cup. It was renovated for the 2006 FIFA World Cup, when it hosted six matches, including the final. The DFB-Pokal final match is held each year there since 1985. The Olympiastadion Berlin served as a host for the 2011 FIFA Women's World Cup as well as the 2015 UEFA Champions League final.

It hosted six games in UEFA Euro 2024, including the final.

During the 1912 Summer Olympics, the city of Berlin was designated by the International Olympic Committee (IOC) to host the 1916 Summer Olympics. Germany's proposed stadium for this event was to be located in Charlottenburg, in the Grunewald Forest, to the west of Berlin—thus the stadium was also known as Grunewaldstadion. A horse racing-course already existed there which belonged to the Berliner Rennverein, and even today the old ticket booths survive on the current Jesse-Owens-Allee. The government of Germany decided not to build in the nearby Grunewald forest, or to renovate buildings that already existed. Because of this desire, they hired the same architect who originally had built the "Rennverein", Otto March.

March decided to build the stadium under the ground ("Erdstadion", in German). However, the 1916 Olympic Games were cancelled due to World War I. In the 1920s the first buildings of a school, the "Deutsches Sportforum" (German Sport Forum), dedicated to the teaching of professors of physical education and the study of sport science were built northeast of the stadium site. From 1926 to 1929, Otto March's sons (Werner and Walter) were assigned to build an annex for these institutions, though the finalization was delayed until 1936.

In 1931, the International Olympic Committee selected Berlin to host the 11th Summer Olympics. Originally, the German government decided merely to restore the earlier Olympiastadion of 1916, with Werner March again retained to do this.

When the Nazi Party won the election in Germany in 1933, they decided to use the Olympic Games to build a new stadium and Olympic Complex for Berlin in 1936. Fuhrer and Reich Chancellor Adolf Hitler ordered the construction of a great sports complex in Grunewald named the "Reichssportfeld" with a new Olympiastadion. Architect Werner March remained in charge of the project, assisted by his brother Walter. When the complex was built it was owned by the Hohenzollern Royal Family (Constitutional Monarchy of Germany), who retained ownership after the games.

Construction took place from 1934 to 1936. When the Reichssportfeld was finished, it was 132 hectares (330 acres). It consisted of (east to west): the Olympiastadion, the Maifeld (Mayfield, capacity of 50,000) and the Waldbühne amphitheatre (capacity of 25,000), in addition to various places, buildings and facilities for different sports (such as football, swimming, equestrian events, and field hockey) in the northern part.

Werner March built the new Olympiastadion on the foundation of the original Deutsches Stadion, once again with the lower half of the structure recessed 12 metres (40 feet) below ground level.

The capacity of the Olympiastadion reached 110,000 spectators. It also possessed a VIP stand. At its end, aligned with the symmetrically designed layout of the buildings of the Olympischer Platz and toward the Maifeld, was the Marathon Gate with a big receptacle for the Olympic Flame.

The Maifeld (Mayfield) was created as a huge lawn (11.2 hectares, 28 acres) for gymnastic demonstrations, specifically annual May Day celebrations by the government. The area was surrounded by 19 metres of land elevation (62 ft), even though the Olympiastadion (to the east) was only 17 metres (55 ft) high. The total capacity was 250,000 people, with 60,000 in the large stands that extended at the west end.

Also located there were the Langemarck-Halle (below) and the Bell Tower (rising high). The walls were built with sturdy stone from the area of the Lower Alps, and also feature equine sculptures (work of Josef Wackerle). This consisted of huge halls built under the stands of the Maifeld. Pillars were raised on which hung flags and shields commemorating all the forces that participated in a battle fought in Langemark (West Flanders, Belgium) on 10 November 1914, during the First World War. Since 2006, the ground floor is home to a public exhibit providing historical information on the area of the former Reichssportfeld.

During the 1936 Olympics, the Maifeld was used for polo and equestrian dressage events.

After the Second World War, the occupying forces of the British Army (Berlin Infantry Brigade) annually celebrated the King's or Queen's Official Birthday on the Maifeld and used it for a variety of sporting activities including cricket. Starting in 2012, Maifeld became home to the cricket clubs of Berlin.

The Bell Tower crowned the western end of the Reichssportfeld planted amid the tiers of the Maifeld stands. It was 77 metres (247 ft) high. From its peak could be observed the whole city of Berlin. During the games, it was used as an observation post by administrators, police officials, doctors, and the media.

In the tower was the Olympic Bell. On its surface were the Olympic rings with an eagle, the year 1936, the Brandenburg Gate, the date 1–16 August in German, a motto between two swastikas: "I call the youth of the world" also in German, and 11. Olympic Games Berlin – although the games were the 10th (Summer) Olympics, they were the Games of the XI Olympiad.

The Bell Tower was the only part of the Reichssportfeld that was destroyed in the war. The Third Reich used the tower's structure to store archives (such as films). The Soviet troops set its contents on fire, turning the tower into a makeshift chimney. The structure emerged from the fire severely damaged and weakened.

In 1947, the British engineers demolished the tower; however, it was reconstructed accurately in 1962. The Olympic Bell (which had survived the fire and remained in its place in the tower) fell 77 metres and cracked and has been incapable of sounding since then. In 1956, the bell was rescued, only to be used as a practice target for shooting with anti-tank ammunition. The damaged old bell survives and serves as a memorial.

The recreation of the tower was carried out from 1960 to 1962, once again by the architect Werner March, following the original blueprints. The present tower became an important tourist destination offering a panorama of Berlin, Spandau, the Havel Valley, Potsdam, Nauen and Hennigsdorf.

The most significant battle around the Olympiastadion was in April 1945 when the Soviet army fought to capture it. This was during the final battle of the Second World War in Europe, with the total invasion of Berlin as the Allies' target. The Olympiastadion survived the war almost untouched; it only suffered the impact of machine gun shots.

After the war, the former Reichssportfeld became the headquarters of the British military occupation forces. The administration settled in the northeastern buildings designed by the March brothers in the 1920s, which the Third Reich had used for official sport organisations such as the Reich Academy of Physical Training and extended by 1936, adding the "Haus des deutschen Sports" (House of German Sports) and other buildings (which belong since 1994 to the Olympiapark Berlin, a central sporting facility of the City of Berlin). Soon, the British forces renovated war-damaged buildings but also converted interiors to their specific needs (one gymnasium was converted into a dining hall, another into a garage). From 1951 to 2005, the Olympischer Platz had a giant antenna transmitting for all the portable radios in Berlin.

From then until 1994 and their departure, British forces held an annual celebration of the Queen's Official Birthday in the Maifeld with thousands of spectators from Berlin present. During the 1960s, American military and high school football teams introduced hundreds of thousands of Berliners to American football at the stadium in exhibition games.

During those years, Bundesliga football matches were played in the Olympiastadion, with Hertha BSC as the local team. In the Maifeld, several competitions of football, rugby and polo were staged too. In the summers, the Waldbühne resumed its classical music concerts, and playing movies. The theatre was also used as an improvised ring for boxing matches.

In 1998, Berliners debated the destiny of the Olympiastadion in light of the legacy it represented for Germany. Some wanted to tear the stadium down and build a new one from scratch, while others favoured letting it slowly crumble "like the Colosseum in Rome". Finally, it was decided to renovate the Olympiastadion.

FIFA chose it as one of the venues of the 2006 FIFA World Cup. The State of Berlin hired a consortium composed of Walter Bau AG and DYWIDAG that won the €45 million franchise. The consortium took charge of the operation of the facilities together with Hertha BSC and the Government of Berlin after the remodelling. On 3 July 2000, the renovation began with a ceremony presided over by the Chancellor Gerhard Schröder, accompanied by Eberhard Diepgen (Mayor of Berlin), Franz Beckenbauer and Prof. Dr. Ignaz Walter.

The re-inauguration celebrations of the new Olympiastadion were carried out on 31 July 2004, and 1 August 2004. On that day, Saturday, the party began with performances from Pink, Nena and Daniel Barenboim. It culminated at night with the opening ceremony. On day two, friendly matches were played between different categories of the club Hertha BSC and visiting teams. On 8 September 2004, Brazil played Germany.

From 2003 to 2007, the stadium was home to the Berlin Thunder.

In 2011, the venue hosted the World Culture Festival organized by the Art of Living where 70,000 people meditated for peace.

In 2018, the venue hosted the 2018 European Athletics Championships.

In 2024, the venue hosted the UEFA Euro 2024 final.