While European intelligence services are reaching new heights when it comes to the depth of their multilateral cooperation, the level of cooperation among European intelligence oversight bodies remains nowhere near as innovative and advanced. Against the backdrop of new forms of multilateral intelligence cooperation and new European cross-system information analysis tools and data centres, this chapter first informs about the current state of play regarding intelligence oversight cooperation: Where has progress been made and where does the buck stop? Next, reviewing the trajectory of recent attempts at more coordinated exchanges between different intelligence oversight bodies, the chapter focuses on the various potential explanatory factors for the (underwhelming) state of affairs. Lastly, it identifies a number of attainable benchmarks for more in-depth cooperation of European intelligence oversight bodies.