• Algonquin Space Campus
• Astronomical Society of Australia
• Astronomy and Astrophysics at Univ of Pisa
• Bologna Radioastronomy Institute
• Brown University Planetary Geology
• Caltech Pulsar Group
• Cambridge University - Institute of Astronomy
• Canadian Astronomy Data Centre
• CfA Optical and Infrared Astronomy Division, Harvard
• CfA Theoretical Astrophysics Division, Harvard
• Cornell University Department of Astronomy
• Duke University
• George Mason University Astronomy
• GSU Astronomy
• Harvard-Smithsonian Center for Astrophysics
• HST Projects, CASS, UCSD
• Indiana University Astronomy
• Infrared Processing & Analysis Center
• Institut fr Astronomie der Universitt Wien
• Inter University Center for Astronomy and Astrophysics (india)
• Iowa State University Physics & Astronomy
• JAC Hilo
• Kapteyn Astronomical Institute
• Lebedev Institute of Phyisics - Astro Space Center
• Netherlands Foundation for Research in Astronomy
• New Mexico State University Astronomy
• Nicolaus Copernicus Astronomical Centre
• Northwestern University Astronomy
• Penn State Astronomy and Astrophysics
• Planetary Science Institute
• Pomona Astronomy Computer
• QUARG - Queen's University Astronomy Research Group
• Saint Mary's Astronomy and Physics
• Space Physics and Astronomy at Rice University
• SUNY Stony Brook Astronomy Group
• U.C. Berkeley - Center for EUV Astrophysics
• UC Santa Barbara Cosmology
• UCLA Institute of Geophysics and Planetary Physics
• UCSD Institute of Geophysics and Planetary Physics
• Univ of Maryland Astronomy Department
• Univ Wisconsin-Madison Space Astronomy Lab
• Univeristy of Minneasota Astronomy Department
• Universidad Nacional Autonoma de Mexico - Astronomia
• University of Amsterdam - Astronomical Institute
• University of Chicago - Astronomy and Astrophysics
• University of Colorado - Astrophysical, Planetary, and Atmospheric Sciences
• University of Jena - Astronomy and Astrophysics
• University of Manchester Astronomy Group
• University of Massachusetts Astronomy Program
• University of Melbourne - Astrophysics Group
• University of Oklahoma - Physics and Astronomy
• University of Rochester - Near Infrared Astronomy Group
• University of Virginia Astronomy
• University of Wales, Cardiff - Department of Physics and Astronomy
• University of Washington Astronomy
• University of Western Ontario Astronomy
• University of Wisconsin - Madison Astronomy Department
• UT Astronomy Supernovae Research
• UT-Austin Astronomy
• Williams College Astronomy Department

This list was taken from Yahoo's Science:Astronomy: Institutes page