Kai Manne Börje Siegbahn (born April 20, 1918) is a Swedish physicist. He earned his doctorate at the University of Stockholm in 1944. He shared the 1981 Nobel Prize in Physics with Nicolaas Bloembergen and Arthur Schawlow for their work in spectroscopy. Siegbahn developed techniques for chemical analysis using high-resolution electron spectroscopy.

His father Manne Siegbahn won the same Nobel Prize in 1924.

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• Kai Manne Boerje Siegbahn