Pooneryn Fort (Tamil: பூநகரிக் கோட்டை, romanized: Pūnakarik Kōṭṭai; Sinhala: පූනරීන් බලකොටුව Punarin Balakotuwa) is located in Pooneryn, adjacent to the Jaffna Peninsula.

It was built by the Portuguese to protect their possessions in Jaffna.

[1] During Dutch possession, the square-shaped fort had two bastions.

In 1805, British built a rest house at the fort.

The fort was under the control of Sri Lankan Army and LTTE during the civil war but is now fully accessible to the public.