Bostryx fragilis is a species of tropical air-breathing land snail, a pulmonate gastropod mollusk in the family Bulimulidae.

The specific epithet fragilis is from the Latin language and means "fragile", it refers to the thin shell.

[1] The shell up to 18.9 mm in height, two times as long as wide, narrowly perforate, elongate, with hardly convex sides and fragile.

[1] Colour is whitish on a translucent background, the upper whorls are becoming gradually tawny-brown towards the apex.

[1] Protoconch is with wrinkles, mostly broken into granules and crossed by finely incised spiral lines.

[1] Finally, it may be compared to Bostryx delicatulus (Philippi, 1867) from which it differs by (1) being stouter, (2) the brownish upper whorls and (3) the simple peristome.