Repo operations of Croatian National Bank are the main subject of this paper work. Repo or reverse repo operations are operations of selling or buying securities with a simultaneous obligation of their purchase or sale in a particular day. Managed by the CNB through open market operations with regular operations, operations of fine adjustment and structural operations. Their implementation is important for maintaining the liquidity of the banking system, but also they have a significant impact on the economy. Repo operation was first conducted in 2005 and till today repo operations were conducted through regular operations and fine adjustment operations, and in 2016 for the first time were used structural operations.