| Vadamarachchi | |
| Native Name: | Tamil: வடமராட்சி Sinhala; Sinhalese: වඩමාරච්චි |
| Settlement Type: | Region |
| Pushpin Map: | Sri Lanka |
| Pushpin Relief: | 1 |
| Coordinates: | 9.7°N 99°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Sri Lanka |
| Subdivision Type1: | Province |
| Subdivision Type2: | District |
| Seat Type: | Largest town |
| Seat: | Point Pedro |
| Parts Type: | Divisional Secretariats |
| Parts Style: | coll |
| P1: | Vadamarachchi East |
| P2: | Vadamarachchi North |
| P3: | Vadamarachchi SW |
| Unit Pref: | Metric |
| Area Total Km2: | 238.6 |
| Population Total: | 106,179 |
| Population As Of: | 2007 |
| Population Density Km2: | auto |
| Timezone1: | Sri Lanka |
| Utc Offset1: | +05:30 |
Vadamarachchi (ta|வடமராட்சி Vaṭamarāṭci, si|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.
Vadamarachchi translates to "possession of northerners" or "rule of the northerners" in English. It is derived from the Tamil words vadamar (northerners) and achchi (possession or rule).[1]