Liu Kai is the name of:

• Liu Kai (Song dynasty) (947–1000), Song dynasty politician and scholar
• Liu Kai (baseball) (born 1987), Chinese baseball player

• Cypraea punctata
• Cypraea pyrum
• Cypraea reticulata
• Cypraea scurra
• Cypraea spadicea
• Cypraea staphylaea
• Cypraea stercoraria
• Cypraea stolida
• Cypraea talpa
• Cypraea teres
• Cypraea testudinaria
• Cypraea teuleri
• Cypraea thomasi
• Cypraea tigris
• Cypraea turdus
• Cypraea ursellus
• Cypraea vitellus
• Cypraea walkeri
• Cypraea zebra
• Cypraea ziczac
• Cypraea zonaria
• Cypraecassis
• Cypraecassis rufa
• Cypraecassis testiculus
• Cypraecassis wilmae