Kosi or Koshi (Nepali: कोसी अञ्चल, Nepali: कोशी अञ्चल Listen) was one of the fourteen zones of Nepal until the restructure of zones to provinces. The headquarters of Kosi Zone was Biratnagar which was also its largest city. Other cities of Kosi Zone were Inaruwa, Dharan, Dhankuta, Jhumka, Duhabi, Tarahara and Itahari. Its main rivers were Arun, Tamor and Sapta Koshi.

Kosi was divided into six districts; since 2015 these districts have been redesignated as part of Province No. 1.

District	Type	Headquarters	Since 2015 part of Province
Bhojpur	Hill	Bhojpur	Province No. 1
Dhankuta	Hill	Dhankuta
Morang	Terai	Biratnagar
Sankhuwasabha	Mountain	Khandbari
Sunsari	Terai	Inaruwa
Terhathum	Hill	Myanglung

• Pindeswari Temple, Dharan
• Budha Subba Temple, Dharan
• Panchakanya Temple, Dharan
• Bishnupaduka Temple, Dharan
• Kali Mandir, Biratnagar
• Chintaangdevi Temple, Dhankuta
• Namaste Jharana, Vedetar
• Ramdhuni Mandir, Dhuni Ban
• Jhumkeshwar Mahadev, Jhumka
• Barahkshetra Mandir Barahachhetra
• Auliya Baba Mandir, Chatara
• Jabdi Mata Mandir, Pakali
• Betana Shimsar, Belbari
• Durgadevi Mandir, Laukahi

• Development Regions of Nepal (Former)
• List of zones of Nepal (Former)
• List of districts of Nepal

27°10′N 87°25′E / 27.167°N 87.417°E / 27.167; 87.417