The incident took place on College Road in Crookhorn at around 2.15pm.
The crash involved a motorbike and a Ford Transit van.
Whilst theÂ van driver was unhurt the teenage motorcycle rider had to beÂ airlifted to Southampton General Hospital..
Investigations into the exact circumstances of the collision are ongoing, and officers would like to speak to anyone who saw what happened.
Officers would also like to hear from motorists who were driving in the area and had a dash cam, as they could have captured something that could help the investigation.
If you have any information, please contact us on 101, quoting reference number Operation DulcetÂ or Crimestoppers anonymously on 0800 555 111.