Ivar Giaever, Norwegian-American physicist and academic, Nobel Prize laureate (died 2025)

Ivar Giaever was a Norwegian-American physicist who shared the 1973 Nobel Prize in Physics with Leo Esaki and Brian Josephson. One half of the prize was awarded jointly to Esaki and Giaever "for their experimental discoveries regarding tunneling phenomena in semiconductors and superconductors, respectively".

The Nobel Prize in Physics is an annual award given by the Royal Swedish Academy of Sciences for those who have made the most outstanding contributions to mankind in the field of physics. It is one of the five Nobel Prizes established by the will of Alfred Nobel in 1895 and awarded since 1901, the others being the Nobel Prize in Chemistry, Nobel Prize in Literature, Nobel Peace Prize, and Nobel Prize in Physiology or Medicine. Physics is traditionally the first award presented in the Nobel Prize ceremony.