Sports organizations in Ljubljana commenced in the second half of the 19th century, but came into full swing only after World War I. That can be seen from the tables for the period before World War I, and between the two World Wars. Just as well the expression sport was given its content from between the two wars, and the activity itself was swiftly carried into effect in the Ljubljana public. The article is supplemented with a review (by name) of sports organizations or clubs in Ljubljana between the two World Wars.