University of Iowa – Heartland Mathematics Partnership
The NSF VIGRE-Heartland REU is designed for highly motivated students who have completed their first two years of college. Younger or more advanced students will be considered. While preference is given to students attending a Heartland Partnership School, any undergraduate student who is a U.S. Citizen or permanent resident may apply. Link: http://www.uiowa.edu/~vigre/reu/index.shtml

Summer Program for Women in Mathematics
Applicants must be U.S. citizens or permanent resident undergraduate women at a U.S. university or college, who are completing their junior year and have mathematical experience beyond the typical first courses in calculus and linear algebra.  Link: http://www.gwu.edu/~spwm/

National Science Foundation REU Information
A comprehensive list of Research Experiences for Undergradutes in mathematics and sciences is found at this site. Link: http://www.nsf.gov/crssprgm/reu/reu_search.cfm (click on Mathematical Sciences)

American Mathematical Society REU Information
American Mathematical Society listing of REUs in mathematics. http://www.ams.org/employment/reu.html (http://www.ams.org/employment/undergrad.html)

Mathematical Association of America (MAA) REU List
Mathematical Association of America listing of REUs specific to mathematics.  Link

The Institute for Advanced Study - Park City Mathematics Institute
Education and research programs that bring together secondary school teachers, undergraduate and graduate students, college and university faculty, and researchers working in the most advanced levels of inquiry in both mathematics and mathematics education. Find out more at the website.