The term White knight can have several meanings.

• The white knight is a chess-piece, often associated with the abstract battle of good against evil. This is the origin of most of the other meanings. See also Black Knight.
• The White Knight is a character in Through the Looking Glass by Lewis Carroll. Based on the chess-piece, this character is a bumbling do-gooder with a penchant for useless inventions.
• White knight (business) is a potential acquirer.
• White Knight is also a chess simulation game designed for the 1980s platform, the BBC Microcomputer - Model B.
• The Scaled Composites White Knight is the name of a jet powered carrier aircraft used to launch Scaled's SpaceShipOne privately funded experimental spacecraft.
• White Knight is also a Chicago Hip House artist from the late 80's early 90's