Kumai may refer to:

• Kumai, subdistrict in Central Kalimantan, Indonesia
• Kumai language, aka Wahgi, a Trans–New Guinea language spoken in the highlands of Papua New Guinea
• Kumai River, river in Central Kalimantan
• Kumai (village), village in the Indian state of Bihar
• Kumai Bahun, better known as Kumaoni people
• Kumai (surname)

• Thornton's grass-tree
• Thornton's grasstree
• Thornton shooting
• Thornton-Smith Building
• Thornton, South Australia
• Thornton Stadium
• Thornton, Steve
• Thornton, Thomas
• Thornton & Thornton
• Thornton Township High School District
• Thornton Township High School District Number 205
• Thornton Township High Schools District 205
• Thornton Twp HS 205
• Thornton v. Caldor
• Thornton viaduct
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• Thornton v. Schreiber
• Thornton, Waikato
• Thornton Walmart shooting
• Thornton W. Burgess Museum
• Thornton Wilder Prize
• Thornton, William
• Thorn-tree Blue
• Thorn-tree blue
• Thorn Tree Cafe