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
See also
- Delano family
- Delannoy numbers, a mathematical sequence named after Henri Delannoy
- Delaunay
- Delone (disambiguation)
- Lannoy (disambiguation)
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