| Baudouin | |
| French: Prince de Ligne | |
| Succession: | 12th Prince of Ligne |
| Reign: | 26 June 1960 - 3 March 1985 |
| Reign-Type: | Tenure |
| Predecessor: | Eugène, 11th Prince of Ligne |
| Successor: | Antoine, 13th Prince of Ligne |
| Spouse: | Countess Monique de Bousies |
| Full Name: | Baudouin Marie Lamoral de Ligne |
| Noble Family: | House of Ligne |
| Father: | Eugène, 11th Prince of Ligne |
| Mother: | Philippine de Noailles |
| Birth Date: | 27 November 1918 |
| Birth Place: | Paris, France |
| Death Place: | Château de Belœil, Belœil, Belgium |
| Religion: | Roman Catholicism |
Baudouin de Ligne, 12th Prince of Ligne, GE (Baudouin Marie Lamoral de Ligne, Prince de Ligne et du Saint-Empire, Prince d'Amblise et d'Epinoy, Grand d'Espagne; 1918–1985) was the head of the princely House of Ligne.
Prince Baudouin was the elder son of Eugène II, 11th prince de Ligne, and his wife, Philippine de Noailles. He had a younger brother, Antoine, and two sisters (Isabelle and Yolande).
Upon the death of his father, he became the head of one of the most prestigious Belgian noble families. Following his death in 1985 without descent, his brother Antoine succeeded him as 13th Prince of Ligne and of the Holy Roman Empire.