Book drops on campus are open 24/7. There is a book drop located outside the south entrance of the Melville Library and outside the doors to the Health Sciences Library.
You can also return books to any SUNY library.
Or, you can mail to the address below.
Stony Brook University Libraries Frank Melville Jr. Memorial Library Attn: Circulation Accounts 100 Nicolls Road, S-3410 Stony Brook, NY 11794-3339