Jaffna Peninsula (Tamil: யாழ்ப்பாணக் குடாநாடு, Yāḻppāṇa kuṭānāṭu) or (Tamil: யாழ் குடாநாடு, Yāḻ kuṭānāṭu) is an area in Northern Province, Sri Lanka. It is home to the capital city of the province, Jaffna, and comprises much of the former land mass of the medieval Jaffna kingdom.

Parts of Jaffna peninsula was historical divided into the three regions of Vadamarachchi, Thenmarachchi and Valikamam, which are today three sections of the Jaffna District.