Wat Ounalom (or Wat Unnalom and several other spellings) is a wat located on Sisowath Quay in Phnom Penh,  near the Royal Palace of Cambodia. It is the headquarters of Cambodian Buddhism.

It was founded by King Ponhea Yat in 1443 and comprises 44 structures. The name meanins Eyebrow Temple (ounalom) to enshrine an eyebrow hair of Lord Buddha.

Before 1974, the pagoda housed over 500 Buddhist monks and also the library of the Buddhist Institute which had a collection of over 30,000 titles. The library was unfortunately destroyed with many other buildings during the years of the Khmer Rogue. The Institute is now re-established and was moved to the Sihanouk Boulevard, where it enjoys a much larger area.