ASIT may refer to:

• ASiT - Association of Surgeons in Training
• Allergen-specific immunotherapy
• Asit River

The Ashit or Asit ( ) is a river in Tatarstan and Mari El, Russian Federation, a left-bank tributary of the Ilet River. It is long, and its drainage basin covers .

The Association of Surgeons in Training (ASiT) is an independent professional body and registered charity working to promote excellence in surgical training. It represents over 2,700 surgical trainees from all ten surgical specialities at both regional and national levels in the United Kingdom and Ireland.