The Madrid Qumran Congress, an International Conference on the Dead Sea Scrolls, was held in Madrid, Spain on March 18-21, 1991.

The Proceedings, edited by Julio Trebolle Barrera and Luis Vegas Montaner, were published by Brill in 1992: see http://www.4enoch.org/wiki2/index.php?title=The_Madrid_Qumran_Congress_(1992_Trebolle_Barrera,_Vegas_Montaner),_edited_volume