Shōnai is a town in Yamagata Prefecture, Japan.

Shōnai may also refer to:

Shōnai, Fukuoka, a former town in Fukuoka Prefecture Shōnai, Ōita, a former town in Ōita Prefecture Shōnai Domain, an Edo period domain Shōnai River, a river in Gifu Prefecture and Aichi Prefecture

See also Shōnai Station (disambiguation)