Oospira duci is a species of air-breathing land snail, a terrestrial gastropod mollusk in the family Clausiliidae, the door snails. This land snail, which was described in 2007, lives in limestone areas in Vietnam. The species was described from just one shell, and thus no details of the anatomy of the soft parts or the radula could be provided. The shell is decollate (which means that several of the earlier whorls have been shed and the shell sealed off anew) making the spire blunt-ended. The specific name duci is in honor of the biologist Le Thien Duc.