The Bentley’s website will update on Tuesday, October 25 at 9:00 a.m. Some downtime may occur. Issues should be resolved by mid-morning.

Where Michigan’s History Lives


The Bentley Historical Library welcomes you to explore and engage with our vast collections. The Library is open without fee to the public, and we welcome researchers regardless of academic or professional affiliation.

Hours and Location


MondayFriday: 9:00am – 5:00pm
Saturday: 9:00am – 1:00pm


April 30, 2016: Closed
May 3, 2016: Memorial Day: Closed
Jul 4, 2016: Independence Day: Closed
August 24, 2016: Close at 1:30 p.m.
September 5, 2016: Labor Day: Closed
November 24-26, 2016: Closed
December 23, 2016: Close at 12:00 p.m.
December 24, 2016 – January 2, 2017: Closed


Bentley Historical Library
1150 Beal Avenue
Ann Arbor, MI 48109-2113


The Bentley Historical Library Reference staff offers assistance in person, by phone, and by email.

Ask An Archivist – this online form can be sent to Reference staff with your questions about our collections, duplication policies, or copyright information.

The library is located on the University of Michigan’s North Campus, and offers free parking on the south side of the building for those who want to research in person. For tips on how to best find what you need while you’re here, please visit the Researching in Person page.

The Detroit Observatory is also part of the Bentley Historical Library. Constructed in 1854, the observatory was the first research facility built at the University of Michigan. Completely restored with original instruments, it is open for tours on select Sundays, and for viewing nights throughout the year. Please visit the Detroit Observatory page for more information.