Lots of them, but the one you probably want is
The International Library in Stockholm
Odengatan 59, 113 22 Stockholm Phone: +46 8 508 312 88
Books in more than 100 different languages. Opening hours: Mon-Thu 9 am - 8 pm, Fri 9 am - 7 pm, Sat-Sun 12 noon - 4 pm.
Other than this, check the yellow pages under "Bibliotek".
Photo: