Propebela rathbuni is a species of sea snail, a marine gastropod mollusk in the family Mangeliidae.

It has a subfusiform shape with an elevated acute spire, forming more than half the total length of the shell.

The whorls of the spire are pretty strongly angulated or carinated a little above the middle by a revolving carina, which appears double at the summit, and slightly nodulous where it is crossed by the longitudinal lines.

Above the carina there is a rather wide, sloping, flattened or slightly concave subsutural band, which is crossed by somewhat raised, moderately excurved lamellae, parallel with the lines of growth and with the sinus in the lip.

The aperture is narrow-ovate, not very large, with a distinct obtuse angle at the base of the columella, which is rather short and nearly straight.