A ring binder includes a housing, a driving mechanism moveable relative to the housing, and rings for holding the loose-leaf pages. Each ring has a first ring member and a second ring member moveable relative to each other between a closed position and an opened position. A ring actuator is positionable relative to the housing and operatively connected to the driving mechanism for moving the ring members between their closed and opened positions. A blocking device blocks the ring members in their closed position against movement to their opened position. The blocking device is positionable relative to the housing between a blocking position wherein the ring members are inhibited by the blocking device against movement from their opened position, and an unblocking position wherein the ring members are selectively moveable from their closed position to their opened position by positioning of the actuator. The blocking device is operable independent of the actuator.