Abstract: This disclosure falls within the field of inflatable balloons and refers to a self-sealing inflatable balloon (1) comprising a lateral flap (3) connected to a neck (2), forming a single structure, where the end of the lateral flap (3) is covered with an adhesive coating (5), protected by a removable protective strip (4), applied over its full length, and where the aforesaid protective strip (4) is removed by the user during its use by extracting the applicable section 4(b), thereby allowing for the complete sealing of the balloon, in a practical, fast, effective manner.