Abstract: A holding device for inflatable balloons or the like which have a balloon envelope and a filling connection has a holding part which has clamping means for the airtight clamping off of the filling connection of the balloon after its inflation. The holding part has the shape of a bowl (2; 2') which is open towards the balloon (1), and the clamping means comprise a groove (6, 7; 6', 7') which is formed in the circumferential wall of the bowl (2; 2') and passes through said circumferential wall, the groove extending from the edge (2a) of the bowl (2; 2') that rests against the balloon envelope upon use and being intended to receive the filling connection (3) of the balloon 1), and a clamping device (4) for the end of the filling connection (3) of the balloon (1) arranged on the outside of the circumferential wall of the bowl (2; 2').