The Cosmopolitan Soccer League is a regional soccer league consisting of semi-pro and amateur teams based in and around New York City. Established in 1923, it is one of the oldest soccer leagues in the United States and has contributed greatly to the nation's soccer history.

Currently, the league has four open divisions. The first two divisions require all clubs to also field reserve teams, a requirement that some leagues have abolished, but which the Cosmopolitan Soccer League believes makes its competition some of the strongest in United States soccer. The league also has an over-30 and an over-40 division. The league is USASA-affiliated.

The Cosmopolitan Soccer League plays a traditional international schedule with competition beginning the second weekend of September and running through June, with a winter break from late December to early March. During the winter months, the league runs an indoor tournament due to New York's cold climate.

The Cosmopolitan Soccer League was formed as the German American Soccer League in 1923. In 1927, the association changed its name to the German American Football Association. The league was highly successful in the 1920s and, in New York, was behind only baseball and basketball in terms of popularity. The league struggled through the Great Depression and by the 1940s the game was viewed by most Americans as an "ethnic" sport. Attendance and popularity declined sharply until the founding of the North American Soccer League in 1968. By the mid-1970s, league officials recognized that in order to maintain the league's viability in the same market as the star-studded New York Cosmos, it needed to appeal to a wider audience and in 1977, it voted to change its name to the Cosmopolitan Soccer League. Prior to the professionalizing of the modern American game, the United States national team often consisted of Cosmopolitan League players.

In 1923, five teams, S.C. New York, Wiener Sports Club, D.S.C. Brooklyn, Hoboken FC 1912 and Newark S.C., banded together to found the German American Soccer League. As the name suggests, the teams were largely composed of recent immigrants from Central Europe, primarily Germany. The next year, four more teams, Swiss F.C., Elizabeth S.C., S.C. Eintracht and Germania S.C., joined the league. The league renamed itself the German American Football Association in 1927. While the GASL began as a single division league, it added a junior division in 1933. That year, the league also held its first indoor tournament. In addition to its junior division, the GASL also added several lower divisions over the decades.

In 1943, all of the U.S. leagues suffered from significant player losses from the U.S. participation in World War II. In order to continue to play a competitive schedule, the GASL joined with the Eastern District Soccer League to run a joint season. Following the end of the war in 1945, the GASL found itself turning from a lack of quality players to an overabundance as Central European professionals left their war ravaged countries to move to the United States. The league experienced a second influx of talented players when Hungarians fled their country following the Soviet Union crushing the 1956 Hungarian Revolution.

In 1964, the GASL joined with the professional American Soccer League in a short lived experiment. That year, the two leagues formed the Eastern Professional Soccer Conference which competed during the GASL/ASL off season. The league was a failure and did not complete its one season in existence. While the merger with the ASL was less than successful, the GASL undertook a cooperative agreement with another league, this time the International Soccer League (ISL) in 1965. That season, the GASL All Star team entered the ISL as the New Yorker, going to the final where it lost to Polonia Bytom 5–1. The string of league mergers continued in 1974 when the National Soccer League of New York merged into the GASL.

In 1977, the GASL changed its name in response to a changing American soccer scene. While soccer had existed as an ethnic sport since the 1930s, the creation of the North American Soccer League in 1968 had brought the sport into the mainstream. Recognizing that maintaining its ethnic identity would hinder its acceptance by the wider U.S. sports culture, the GASL governing board voted to rename the league the Cosmopolitan Soccer League. As part of this process, the league's teams were directed to change their names to ones with less ethnic connotations, although this requirement was dropped three years later.

Despite the regional and semi-professional nature of the league, it featured many of the top U.S. player in the 1950s and 1960s. Even into the early 1970s, GASL players appeared regularly with the U.S. national team. The high regard afforded to the league is reflected in that the National Soccer Hall of Fame considers the GASL as one of a handful of leagues in which a player may become eligible for entry into the Hall of Fame.

List of the participants in the current season:^[1] The top former CSL teams play in the Eastern Premier Soccer League, which together with Maryland Major Soccer League, created a regional based multi-league promotion and relegation system between these leagues.^[2][3]

• Both Elizabeth S.C. and New York Hota/Bavarian SC hold the title of champion for the 1970–1971 season

Source^[16]

• Soccer in New York City
• Eastern New York State Soccer Association