Margaret de Bohun may refer to:

• Margaret of Hereford (1122/1123–1197), English noblewoman, eldest daughter of Miles de Gloucester, 1st Earl of Hereford, wife of Humphrey II de Bohun
• Margaret de Bohun, Countess of Devon (1311–1391), English noblewoman, granddaughter of King Edward I and Eleanor of Castile, wife of Hugh Courtenay, 10th Earl of Devon

• Decapterus pinnulatus
• Decapterus punctatus
• Decapterus rhonchus
• Decapterus sanctaehelenae
• Decapterus santa-helenae
• Decarbonization
• Decarbonylation
• Decarboxycysteine
• Decarboxycystine
• Decarburized steel
• Decarchy
• De Carency
• Decarie
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• Decarie Boulevard
• Decarie Expressway
• Decarie Interchange
• Decaris
• Decaris, Albert
• De Caritat
• Decaro
• De Cartier
• De cartier
• Decarynella
• Decarynodes