Vadamarachchi (Tamil: வடமராட்சி Vaṭamarāṭci, Sinhala: වඩමාරච්චි) is one of the three historic regions of the Jaffna peninsula in northern Sri Lanka.

The other two regions are Thenmarachchi and Valikamam.

Alternative spellings include Vadamarachi, Vadamaraachi or Vadamaraadchi.

It is derived from the Tamil words vadamar (northerners) and achchi (possession or rule).

This Northern Province, Sri Lanka location article is a stub.