Nankai (disambiguation)
Nankai () is a term in Chinese and Japanese. It may refer to:
 Nankai (), a series of schools in China
 Nankai District (), Tianjin, China
 Nankai Electric Railway (), a railway company in Japan
 Nankai Club and Nankai Hawks, (), former names of the Fukuoka SoftBank Hawks, a professional Japanese baseball team
 Nankai Broadcasting (), a broadcasting company in Japan
 Nankai Trough (), a submarine trough south of Japan
 Nankai megathrust earthquakes (), a series of earthquakes that occur in and around the Nankai trough

See also 
 Nankaidō, administrative unit in ancient Japan