Casque is a French word for helmet. It can refer to:

• Casque (anatomy), an enlargement on the beaks of some species of birds, including many hornbills
• Hornbill ivory, the casque of the helmeted hornbill, collected as a decorative material
• S. C. H. "Sammy" Davis (1887–1981), a motor-racing journalist who used the pen name Casque
• Casque-class destroyer, French Navy ships built between 1910 and 1912

• Casque and Gauntlet, a senior society at Dartmouth College
• Cask (disambiguation)
• Kask (disambiguation)
• CASC (disambiguation)
• KASC (disambiguation)