Nuphar oguraensis is a species of rhizomatous aquatic plant endemic to Japan.

The 2.5-3 cm long, and 1.5-2 cm wide fruit bears brown, 3.5-4 mm long, and 2.5 mm wide seeds.

[1] The lectotype is an illustration of this species in the original publication by Shigeru Miki.

[2] It is threatened by urbanisation and land development.

[2] It occurs in rivers, lakes, ponds, and ditches.