A device for holding endotracheal tubes comprising: a bite tube (1) that defines a passage zone (11) for at least one endotracheal tube (T), a front plate (2) and an adjustable retainer (3) joined to the bite tube (1), and which form means for limiting displacement of the bite tube (1) in an axial direction towards the interior and exterior of the mouth of the patient, respectively; and means for immobilising at least one endotracheal tube with respect to the bite tube (1) in an axial direction. The device comprises a lateral opening (5) along the entire length of the bite tube (1), the front plate (2) and the adjustable retainer (3) for lateral or transversal introduction of at least one endotracheal tube (T) into the passage zone (11) defined by the bite tube (1).