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Widener is located in Harvard Yard, across from Memorial Church.
The US Postal Service address for Widener (for all mail, letters and packages):
Widener Library
Harvard University
Cambridge, MA 02138
The address for FedEx and UPS is:
Widener Library
One Harvard Yard (They seem to insist on a street #)
Harvard University
Cambridge, MA 02138
The street address for Mass. Ave. is sometimes given as Widener Library, 1329 Mass. Ave., Cambridge MA 02138
Monday-Thursday 9am-9pm
Friday-Saturday 9am-5pm
Sunday 12noon-7pm
Chat is intended for brief inquiries from the Harvard community.
Reach out to librarians and other reference specialists by email using our online form. We usually respond within 24 hours Monday through Friday.
Talk to a librarian for advice on defining your topic, developing your research strategy, and locating and using sources. Make an appointment now.
These services are intended primarily for Harvard University faculty, staff and students. If you are not affiliated with Harvard, please use these services only to request information about the Library and its collections.
Our chat reference and Research Appointment Request services are intended for Harvard affiliates. All others are welcome to submit questions using the form on this page.
We are happy to answer questions from all Harvard affiliates and from non-affiliates inquiring about the library's collections.
Unfortunately, we're unable to answer questions from the general public which are not directly related to Harvard Library services and collections.