Mannerheim League for Child Welfare

The Children's Castle, located in Kallio, was inaugurated in October 1921 by the Mannerheim League for Child Welfare. On the front line from left to right: Bishop Jaakko Gummerus, Superintendent Sophie Mannerheim, her brother General C. G. E. Mannerheim, Superintendent Toini Leikola, and Professor Arvo Ylppö.

Mannerheim League for Child Welfare (Finnish: Mannerheimin Lastensuojeluliitto ry (MLL); Swedish: Mannerheims Barnskyddsförbund rf) is a Finnish non-governmental organization founded in 1920 that promotes the well-being of children, young people and families with children. MLL's goal is a child-friendly Finland. It can be attributed to the construction of a comprehensive counseling system in Finland.