Notodiaphana fragilis is a species of marine snail, gastropod mollusk in the clade Architectibranchia.

The shell is minute, thin, fragile, colorless to translucent, and usually less than 5 mm in size.

[citation needed] The shells resemble those of the genus Haminoea.

[citation needed] The distribution of Notodiaphana fragilis includes the Indian Ocean.

[citation needed] This species occur in the sublittoral to abyssal zones.