Allaippiddi or Allaipiddy (Tamil: அல்லைப்பிட்டி, Sinhala: අලපිටිය Alapitiya) is a village on Velanai Island off the coast of the Jaffna peninsula within Sri Lanka's Northern Province.

Allaipiddy is strategically located on the causeway from Jaffna towards islets of Velanai and Kayts through Pannai bridge. After Mandaitivu, past the abandoned aluminium factory, lies a large Sri Lanka Navy garrison, 500 meters (1,600 ft) from Allaipiddy.

Most residents of the village are Sri Lankan Tamils and the majority are Roman Catholics. In May 2006, the population was estimated to be around 800. At least 150 residents fled the village after the Allaipiddy massacre of May 13, 2006.

This article's list of people may not follow Wikipedia's verifiability policy. Please improve this article by removing names that do not have independent reliable sources showing they merit inclusion in this article AND are members of this list, or by incorporating the relevant publications into the body of the article through appropriate citations. (November 2022)

• Vinayakamoorthy, farmer and father, was born in Allaipiddy
• Antonythasan Jesuthasan, author and actor, was born in Allaipiddy.

• Allaipiddy massacre
• St. Philip Neri Church bombing

9°37′N 79°58′E / 9.617°N 79.967°E / 9.617; 79.967