Kai Manne Börje Siegbahn (20. aprill 1918 Lund – 20. juuli 2007 Ängelholm) oli rootsi füüsik.
Tema isa oli füüsik Manne Siegbahn, kes sai Nobeli füüsikaauhinna 1924. aastal.
1944. aastal sai ta Stockholmi ülikoolis doktorikraadi.
1981. anti talle, Nicolaas Bloembergenile ja Arthur Schawlowle Nobeli füüsikaauhind töö eest laserspektroskoopias.

- 1901 Röntgen
- 1902 Lorentz, Zeeman
- 1903 Becquerel, P. Curie, M. Curie
- 1904 Rayleigh
- 1905 Lenard
- 1906 J. Thomson
- 1907 Michelson
- 1908 Lippmann
- 1909 Marconi, Braun
- 1910 Waals
- 1911 Wien
- 1912 Dalén
- 1913 Kamerlingh Onnes
- 1914 Laue
- 1915 W. H. Bragg, W. L. Bragg
- 1917 Barkla
- 1918 Planck
- 1919 Stark
- 1920 Guillaume
- 1921 Einstein
- 1922 N. Bohr
- 1923 Millikan
- 1924 M. Siegbahn
- 1925 Franck, Hertz
- 1926 Perrin
- 1927 Compton, C. Wilson
- 1928 Richardson
- 1929 Broglie
- 1930 Raman
- 1932 Heisenberg
- 1933 Schrödinger, Dirac
- 1935 Chadwick
- 1936 Hess, Anderson
- 1937 Davisson, G. Thomson
- 1938 Fermi
- 1939 Lawrence
- 1943 Stern
- 1944 Rabi
- 1945 Pauli
- 1946 Bridgman
- 1947 Appleton
- 1948 Blackett
- 1949 Yukawa
- 1950 Powell
- 1951 Cockcroft, Walton
- 1952 Bloch, Purcell
- 1953 Zernike
- 1954 Born, Bothe
- 1955 Lamb, Kusch
- 1956 Shockley, Bardeen, Brattain
- 1957 Yang, T. Lee
- 1958 Tšerenkov, Frank, Tamm
- 1959 Segrè, Chamberlain
- 1960 Glaser
- 1961 Hofstadter, Mößbauer
- 1962 Landau
- 1963 Wigner, Goeppert-Mayer, Jensen
- 1964 Townes, Bassov, Prohhorov
- 1965 Tomonaga, Schwinger, Feynman
- 1966 Kastler
- 1967 Bethe
- 1968 Alvarez
- 1969 Gell-Mann
- 1970 Alfvén, Néel
- 1971 Gábor
- 1972 Bardeen, Cooper, Schrieffer
- 1973 Esaki, Giaever, Josephson
- 1974 Ryle, Hewish
- 1975 A. Bohr, Mottelson, Rainwater
- 1976 Richter, Ding
- 1977 Anderson, Mott, Vleck
- 1978 Kapitsa, Penzias, R. Wilson
- 1979 Glashow, Salam, Weinberg
- 1980 Cronin, Fitch
- 1981 Bloembergen, Schawlow, K. Siegbahn
- 1982 K. G. Wilson
- 1983 Chandrasekhar, Fowler
- 1984 Rubbia, Meer
- 1985 Klitzing
- 1986 Ruska, Binnig, Rohrer
- 1987 Bednorz, Müller
- 1988 Lederman, Schwartz, Jack Steinberger
- 1989 Ramsey, Dehmelt, Paul
- 1990 Friedman, Kendall, R.Taylor
- 1991 Gennes
- 1992 Charpak
- 1993 Hulse, J. Taylor
- 1994 Brockhouse, Shull
- 1995 Perl, Reines
- 1996 D. Lee, Osheroff, Richardson
- 1997 Chu, Cohen-Tannoudji, Phillips
- 1998 Laughlin, Störmer, Tsui
- 1999 't Hooft, Veltman
- 2000 Alfjorov, Kroemer, Kilby
- 2001 Cornell, Ketterle, Wieman
- 2002 Davis, Koshiba, Giacconi
- 2003 Abrikossov, Ginzburg, Leggett
- 2004 Gross, Politzer, Wilczek
- 2005 Glauber, Hall, Hänsch
- 2006 Mather, Smoot
- 2007 Fert, Grünberg
- 2008 Nambu, Kobayashi, Maskawa
- 2009 Kao, Boyle, Smith
- 2010 Geim, Novosjolov
- 2011 Perlmutter, Riess, Schmidt
- 2012 Haroche, Wineland
- 2013 Englert, Higgs
- 2014 Akasaki, Amano, Nakamura
- 2015 Kajita, McDonald
- 2016 Thouless, Haldane, Kosterlitz
- 2017 Weiss, Barish, Thorne
- 2018 Ashkin, Mourou, Strickland
- 2019 Peebles, Mayor, Queloz
- 2020 Penrose, Genzel, Ghez