王国国玺(英语:Great Seal of the Realm,又称英国国玺,Great Seal of the United Kingdom;在《1707年联合法令》之前被称为英格兰国玺,Great Seal of England;在《1800年联合法令》之前则称为大不列颠国玺,Great Seal of Great Britain)为一枚标明经英国君主同意之重要国书的印章。
Bedos-Rezak, Brigitte. The king enthroned, a new theme in Anglo-Saxon royal iconography: the seal of Edward the Confessor and its political implications. Rosenthal, J.T. (编). Kings and Kingship. Binghamton, NY: State University of New York: Center for Medieval and Early Renaissance Studies. 1986: 53–88.