Three Nobel Prize Winners in a row for the Department of Physics (four in a row for the Physics community at Stanford).

Professor Robert Laughlin's 1998 Nobel in Physics
Professor Steven Chu's 1997 Nobel in Physics
Professor Douglas Osheroff's 1996 Nobel in Physics

Other Physics Nobel Prizes for Stanford:

• Martin Perl (at SLAC), 1995 
• Richard Taylor (SLAC and Physics), 1990 
• Arthur Schawlow, 1981 
• Burton Richter (SLAC), 1976 
• Robert Hofstadter, 1961 
• Felix Bloch (Stanford's first Nobel, namesake of the original and new Bloch Lecture Hall, Hewlett room 201), 1952

Other Physics Nobel Laureates who were Stanford faculty (at the time of, after, or before receiving the Nobel):

• Willis E. Lamb Jr., 1955 (Professor 1951-1956)
  
• William Shockley, 1956 (EE Lecturer 1955-63, Prof. of Engr. 1963-75)
• Sheldon Glashow, 1979 (Assistant Professor, 1961-62)
• Melvin Schwartz, 1988 (Professor 1966-1984)
• Henry W. Kendall, 1990 (Assistant Professor 1958-1961)
• Theodor W. Hänsch, 2005 (Asst.Prof. 1972-75, Prof. 1975-1986)

• Kenneth G. Wilson, 1982 (at SLAC, 1969-70)
  
• Jerome I. Friedman, 1990 (Research Associate 1957-60)
• Eric A. Cornell, 2001 (Stanford B.S. 1985)
  
• Carl E. Wieman, 2001 (Stanford Ph.D. 1977)
  

The Stanford News Service has a good summary of current faculty, deceased, and Stanford-related Nobel Laureates.

Visit the Nobel site for even more information.