Caliburn may refer to:
Caliburn is another name for Excalibur, the legendary sword of King Arthur in Arthurian legend. The Excalibur is King Arthur's sword, the one he obtained from the Lady in the Lake, after the one he pulled from the stone broke. Excalibur itself is thought to be derived from Caladbolg, which in itself may be drawn from the Welsh Caledfwlch, which can be latinised as Caliburnus. The legends state the sword was virtually peerless and only passed to the chosen. However, King Arthur was mortally wounded while wielding the sword by his son, Mordred in the battle of Camlann. Upon his death, it was either Sir Lancelot or Sir Griflet who, after much hesitation about discarding such a powerful sword, returned the Excalibur to the Lady in the Lake.