The narrow-striped mongoose or narrow-striped vontsira (Mungotictis decemlineata) is a member of the family Eupleridae endemic to Madagascar. It inhabits the western Madagascar succulent woodlands and northern Madagascar spiny thickets in western and southwestern Madagascar, where it lives from sea level to about 125 m (410 ft) between the Tsiribihina and Mangoky rivers. In Malagasy it is called bokiboky (pronounced "Boo-ky Boo-ky"). It is the only species in genus Mungotictis.

Galidia decemlineata was the scientific name used by Alfred Grandidier in 1867 for a mongoose collected on the west coast of Madagascar. It was placed in the genus Mungotictis by Reginald Innes Pocock in 1915.

The narrow-striped mongoose is part of the Malagasy carnivore family Eupleridae that forms a monophyletic clade. It shares a common ancestor with sister clades of the Feliformia.