The Imagine Peace Tower is a memorial to John Lennon from his widow, Yoko Ono, located on Viðey Island in Kollafjörður Bay near Reykjavík, Iceland. Installed in 2007, it consists of a tall tower of light, projected from a white stone monument that has the words "Imagine Peace" carved into it in 24 languages. These words, and the name of the tower, are a reference to Lennon's campaign for peace, and his 1971 song "Imagine".

Yoko Ono is a Japanese multimedia artist, singer, songwriter, and peace activist. Her work also encompasses performance art and filmmaking.