Idealist.org
Internships at non-profit organizations.

Indeed.com
Search millions of job postings gathered directly from the web. Select Advanced Search, then Internship as type of job.

SimplyHired
Search job listings by keyword and location. Select Advanced Search, then Internship as type of job.

Association of Neuroscience Departments and Programs
Association of Neuroscience Departments and Programs (ANDP) Summer Undergraduate Research Position Listings.

Biology/ Biotech / Science Internships
A compilation of biology and biotech internships and co-op positions from RIT.

Biology Internships
Directory of biology internships.

Business/Finance/Insurance
Internship listings from InternSearch.

Carter Center Internship Program
Opportunities for undergraduate juniors and seniors, recent graduates, and graduate/professional students who are interested in contemporary international and domestic issues.

Corporate Summer Internships for Students of Color
Accounting, asset management, corporate law and management consulting internships.

Everett Public Service Internship Program
Summer public service internships.

Federal Internships Directory
Search for internships by agency, major, career field, and class year.

Federal Student Internship Programs
Student internship programs with the federal government.

Getting an internship in Orlando, Florida (OASIS)
Internship placement program in Orlando.

Health, Fitness and Wellness
Intern listings from InternSearch.

Institute for Humane Studies
Print, broadcast, production, pubic policy, and non-profit internships.

UniversityConnect
D irectory containing over 2,800 internship programs in over 45 industry/career categories.

InternHere
Internship opportunities in the Hartford/Springfield Region.

IBM Internship and Co-op Program
Real-world experience that accelerates preparation for a professional career.

Internship Programs
Search the database or view internships at selected employers.

Internships in Historic Preservation
List of historic preservation internships. From Cornell University.

Internships in Youth Development
Over 2000 internships which will give you the experience needed to get started in a career working with or in behalf of young people and their families. From The National Assembly.

InternWeb.com
Search for internships by type of internship, type of employer and location.

Journalism
Internship listings from InternSearch.

Live, Learn & Intern in Washington, DC
Capitol Hill, lobby firms, think tank and political organization internships designed for students majoring in public policy, politics, economics and international relations.

Magazine Internships
List of magazines which offer internship programs and what is required to apply.

Marketing/Communications
Internship listings from InternSearch.

Neuroscience Undergraduate Summer Research Program
Program for New Jersey Students.

New York City Summer Internship Program
Summer internships with the City of New York.

One Day One Internship
Guide to unique and exciting entry-level job and career opportunities for recent college graduates.

Orion Grassroots Network Internship Service
Internships around the country in conservation, education, restoration, and environmental justice.

Pfizer Internships
Science (and other) internships at Pfizer.

Pre-Med Internships
Co-op/Internship Opportunities for Pre-Medical Students.

Roswell Park Cancer Institute
Summer research programs for college students.

R.S. Dow Neurological Sciences Institute
Summer Fellowship Program.

Resort/Recreation/Sports Management
Internship listings from InternSearch.

Rising Star Internships
Search from a lengthy list of internship categories.

Smithsonian Institution
Smithsonian internship and fellowship opportunities.

Student Conservation Association
Conservation internships, short-term jobs and career information.

Summer Internship Program in Biomedical Health
Summer positions at the National Institute for Health.

Summer Internships in Biology
A list of summer internships in the field of biology around the country.

Summer Undergraduate Research Fellowship
Science and engineering funding research summer internships.

The Leadership Alliance
Summer research internships.

TV Internships
Internship listings at networks, TV stations, cable, radio and more.  From TVJOBS.com.

Volunteer For a Changing World
Opportunities with the US Geological Survey. Academic credit available for college students.

Walt Disney World College Program
Credit bearing internships for college students at Walt Disney World.

Washington Center
Academic year and summer internships in Washington, DC in a variety of career fields.

Washington DC Big Internship Guide 
Guide to Washington DC internships listed by type of internship.