Number Eight may refer to:

• 8 (number), the natural number
• 8 (J.J. Cale album) by the American singer-songwriter and musician
• Number 8, Pershore, community arts centre in England, United Kingdom
• Number Eight (Battlestar Galactica), a character from the 2003 version of the television series Battlestar Galactica
• Number Eight, a character in the episode "The Chimes of Big Ben" from the television series The Prisoner
• #8, the pseudonym of American musician Corey Taylor, when performing with Slipknot
• Number eight (rugby union), a rugby union position
• The Rifle, No 8 .22 cadet rifle used by UK Cadet Forces

• 8 (disambiguation)