Kieler Sportvereinigung Holstein von 1900 e.V., also known as Holstein Kiel or KSV Holstein, is a privately owned German sports club headquartered in Kiel, Schleswig-Holstein. Founded in 1900, the club employs approximately 100 individuals and reported $38.0M in revenue as of 2023. Primarily focused on spectator sports, specifically association football, the club was a dominant side in northern Germany from the 1900s through the 1960s. Its historical achievements include winning the German football championship in 1912, being vice-champions in 1910 and 1930, and securing six regional titles with nine runner-up finishes. Holstein Kiel maintained a first-division status until the formation of the Bundesliga in 1963 and made its debut in the Bundesliga in the 2024–25 season after gaining promotion from the 2. Bundesliga in 2024.