KSZO Ostrowiec Świętokrzyski () is a Polish football club based in Ostrowiec Świętokrzyski, Poland. It was founded on August 11, 1929. History Initially, a club called Ostrovia existed in the city. It was established between 1922 and 1924 and dissolved in 1926. KSZO was established in 1929. The construction of the club's stadium began in 1931 and finished in 1934. As a result of the Nazi invasion of Poland, the club's activities ceased in 1939. The club activities resumed in 1945. Between 1949 and 1956, the club was called Stal. In 2012, the club declared bankruptcy. The same year, it was reorganized under the same name and badge. League history KSZO joined the C klasa, the lowest level of regional leagues in Poland at the time, in 1932 gaining promotion to B klasa the same year. In 1934, the club was promoted to A klasa, the top regional level. In 1937, it was moved to the Kraków Regional Football Association as the regional association based in Kielce the club hitherto belonged to was disbanded. Having resumed activity after World War II, the club participated in lower-level regional leagues. In 1950, KSZO (then called Stal) was merged with another local club, Związkowiec. The management of the steelworks decided to focus on building a better football team. From the 1960s until the early 1980s, KSZO took part in third-level competitions several times. However, the club wasn't able to advance further or maintain their place for more than a few seasons. In the early 90s, the steelworks became more committed to financing the club's activities. In 1990, the club was promoted to the III liga, the third level of Polish association football at the time, once again. Five seasons later, KSZO was promoted to the second tier for the first time. In 1995/96, the first season after promotion to the eastern group of II liga, KSZO finished 13th out of 18 teams, avoiding relegation by just 3 points. However, at the end of the following season, the club was ranked second behind Petrochemia Płock and won promotion to the top tier of Polish football. 1997/98, the first season of KSZO in Ekstraklasa ended in relegation as the club only managed to finish 17th out of 18 teams. Having returned to the second level, KSZO was fourth in the eastern group 1998/99. Next season, both groups were merged to create one 24-team second division.