Kahnuj is a city in Kerman Province, Iran.

Kahnuj (Persian: كهنوج) may also refer to:

• Kahnuj, Ahmadi, Hormozgan Province
• Kahnuj, Fareghan, Hormozgan Province
• Kahnuj-e Bozorg, Hormozgan Province

• Kahnuj
• Kahnuj, Baft, Kerman Province
• Kahnuj, Bam, Kerman Province
• Kahnuj, Jiroft, Kerman Province
• Kahnuj, Mahan, Kerman Province
• Kahnuj, Zangiabad, Kerman Province
• Kahnuj-e Moezabad, Kerman Province
• Kahnuj-e Shahrokhi, Kerman Province
• Kahnuj, Rabor, Kerman Province
• Kahnuj, Ravar, Kerman Province
• Kahnuj, Pa Qaleh, Shahr-e Babak County, Kerman Province
• Kahnuj, Hotkan, Zarand County, Kerman Province
• Kahnuj, Sarbanan, Zarand County, Kerman Province
• Kahnuj County, in Kerman Province

• Kahnuj, Behabad, in Behabad County
• Kahnuj, Asfyj, in Behabad County

• Kannauj, a city in Uttar Pradesh, India
  • Kannauj (Lok Sabha constituency)
  • Kannauj (Assembly constituency)