Nankai () is a series of schools in China.

Nankai () may also refer to: 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 radio and television broadcaster in Ehime Prefecture, Japan Nankai Trough (), a submarine trough south of Japan Nankai megathrust earthquakes (), a series of earthquakes that occur in and around the Nankai trough Nakai, a Japanese food supply ship of WW2, later renamed Nosaki

See also Nankaidō, administrative unit in ancient Japan 南海 (disambiguation), the East Asian script for "South Sea"