Delannoy

De Lannoy or Delannoy is a surname, and may refer to;
 * Noble Belgian House of Lannoy:
 * Jean de Lannoy
 * Baldwin of Lannoy
 * Hugo van Lannoy
 * Guillebert de Lannoy, soldier, traveller and diplomat
 * Charles de Lannoy, 1st Prince of Sulmona: soldier and statesman
 * Philip de Lannoy, 2nd Prince of Sulmona, military leader
 * Countess Stéphanie de Lannoy, now the Hereditary Grand Duchess of Luxembourg
 * Others
 * Albert Delannoy, long jumper
 * Colinet de Lannoy, composer
 * Eustachius De Lannoy, naval commander
 * Henri Delannoy (1833–1915), French military officer and amateur mathematician
 * Jean Delannoy, actor and film director
 * Louis De Lannoy, cyclist
 * Luc Delannoy, writer and philosopher
 * Marcel Delannoy (1898–1962), French composer
 * Claire Delannoy, French writer
 * Robert Delannoy, World War I flying ace
 * Sandra Delannoy, French politician