National Science Foundation REUs

Astronomical Sciences:
https://www.nsf.gov/crssprgm/reu/list_result.jsp?unitid=5045

Biological Sciences:
https://www.nsf.gov/crssprgm/reu/list_result.jsp?unitid=5047

Chemistry:
https://www.nsf.gov/crssprgm/reu/list_result.jsp?unitid=5048

Earth Sciences:
https://www.nsf.gov/crssprgm/reu/list_result.jsp?unitid=5050

Ethics and Values Studies:
https://www.nsf.gov/crssprgm/reu/list_result.jsp?unitid=10024

Engineering:
https://www.nsf.gov/crssprgm/reu/list_result.jsp?unitid=10006

Mathematical Sciences:
https://www.nsf.gov/crssprgm/reu/list_result.jsp?unitid=5044

Ocean Sciences:
https://www.nsf.gov/crssprgm/reu/list_result.jsp?unitid=5053

Physics:
https://www.nsf.gov/crssprgm/reu/list_result.jsp?unitid=69

Social, Behavioral, and Economic Sciences:
https://www.nsf.gov/crssprgm/reu/list_result.jsp?unitid=5054

Other REUs

Immigration and Border Community Research Experience for Undergraduates (University of Missouri, Kansas City)
https://info.umkc.edu/polisciblog/?cat=9

Calder Summer Undergraduate Research Program (Fordham University)
https://www.fordham.edu/info/21461/research_opportunities_for_undergraduates

Mathematical and Theoretical Biology Institute (Arizona State University)
https://mtbi.asu.edu/SummerProgram

International Research Experience for Students in Uzbekistan (California State University, Fullerton)
http://www.fullerton.edu/ires-uz/

Fields Institute Undergraduate Summer Research Program (University of Toronto)
http://www.fields.utoronto.ca/activities/18-19/2018-fusrp

Harvard School of Public Health
https://www.hsph.harvard.edu/biostatistics/diversity/summer-program/eligibility-application/

Naval Research Enterprise Internship Program
http://nreip.asee.org/

Fred Hutchinson Cancer Research Center 
http://www.fredhutch.org/en/education-training/undergraduate-students.html

University of Michigan School of Public Health
https://sph.umich.edu/bdsi/