Hertha performed consistently well on the field, including a win in the first Berlin championship final in 1905. However, their on-field success was not matched financially and in 1920 Hertha merged with the well-heeled club Berliner Sport-Club to form Hertha Berliner Sport Club. The new team continued to enjoy considerable success, while also enduring a substantial measure of frustration. The team played its way to the German championship final in six consecutive seasons from 1926 to 1931, but were only able to come away with the title in 1930 and 1931 with BSC leaving to become an independent club again after the combined side's first championship. Even so, Hertha emerged as the Germany's second most successful team during the inter-war years.
Tensions between the western Allies and the Russians occupying various sectors of the city, and the developing Cold War, led to chaotic conditions for football in the capital. Hertha was banned from play against East German teams in the 1949-50 season after taking on several players and a coach who had fled the Dresden club SG Friedrichstadt for West Berlin. A number of sides from the eastern half of the city were forced from the Oberliga Berlin to the newly established DDR-Liga beginning with the 1950-51 season.
Through the 50's an intense rivalry developed with Tennis Borussia Berlin. A proposal for a merger between the two clubs in 1958 was resoundingly rejected.
However, Hertha was again soon touched by scandal through its involvement with several other clubs in the Bundesliga match fixing scandal of 1971. In the course of an investigation of Hertha's role, it was also revealed that the club was 6 million DM in debt. Financial disaster was averted through the sale of the team's former home ground.
In spite of this, the team continued to enjoy a fair measure of success on the field through the 70's with a second place Bundesliga finish behind Borussia Moenchengladbach in 1974-75, a semi-final appearance in the 1979 UEFA Cup, and two appearances in the final of the German Cup (1977 and 1979). The following season saw the fortunes of the team take a turn for the worse as they were relegated to 2.Bundesliga where they would spend thirteen of the next seventeen seasons.
Plans in 1982 for a merger with Tennis Borussia, Blau Weiss 90 and SC Charlottenburg to form a side derisively referred to as FC Utopia never came to fruition. Hertha slipped as low as the third tier Amateur Oberliga Berlin where they spent two seasons (1986-87 and 1987-88). Two turns in the Bundesliga (1982-83 and 1990-91) saw the team immediately relegated after poor performances. Hertha's amateur side enjoyed a greater measure of success, advancing all the way to the final of the German Cup in 1993 where their run ended in a close 0:1 defeat at the hands of Bundesliga side Bayer Leverkusen.
Financial woes once more burdened the club in 1994 as it found itself 10 million DM in debt. The crisis was again resolved through the sale of real estate holdings in addition to the signing of a new sponsor and management team. By 1997 Hertha found its way back to the Bundesliga where they have generally managed to finish in the upper third of the slate. When Hertha was promoted in 1997, it ended Berlin's six-year-long drought without a Bundesliga side which made the Bundesliga the only top league in Europe without representation from the country's biggest city and capital.
Most recently, bright spots for the side have been a continuous string of appearances in international play in the UEFA Cup and the UEFA Champions League beginning in the 1999 season, and the signing of players such as Sebastian Deisler and Brazilian international Marcelinho, named the Bundesliga's player of the year in May of 2005. Hertha has also invested heavily in its own youth football academy, which has produced several players with Bundesliga potential.
The team was almost relegated in the 2003-04 season, but rebounded and finished 4th the following season, but missed out on the Champions League after they were held to a draw on the final day by Hannover 96, which saw Werder Bremen over take them for the spot on the final day. As a thank-you gesture, Werder sent the Hannover squad ninety-six bottles of champagne. In 2005-06 the Herthaner finished 6th, and qualified for the UEFA Cup by defeating FK Moskva in the Intertoto Cup but stopped at the first round of the UEFA Cup by Odense BK. In 2006-07 Hertha finished 10th after sacking manager Falko Götz at April 11th. Hertha starts saison 2007-08 with a new manager, Lucien Favre from the Swiss Champion of 2006 and 2007, FC Zürich. They finished 10th again, but starting in the first qualification round of the UEFA Cup via Fair Play Ranking with Danish club FC Nordsjælland, and Premier League side Manchester City.
The stadium hosts the annual German Cup final and was also the site for six matches of the 2006 FIFA World Cup as well as the tournament final.
From 1904, Hertha's home ground was the Plumpe in the city's Wedding (Gesundbrunnen) district. A stadium was built there in 1923 with a capacity of 35,000 (3,600 seats). The club left the stadium when it joined the Bundesliga in 1963. The sale of the site in 1974 helped the club avoid bankruptcy
For recent transfers, see List of German football transfers summer 2008.