A tampon applicator, including: a vaginal insertion tube intended to house the tampon to be used, and a plunger which is mounted coaxially in one end of the tube and which is used to push and release the tampon through a second end of the tube. According to tan embodiment, the applicator can be re-used and the insertion tube includes a side window through which a tampon can be inserted into the tube, before each use of the applicator by the user.