Haworthia truncata, locally known as horse's teeth, is a species of succulent plant in the genus Haworthia. It is found in the Little Karoo region, in the far east of the Western Cape Province, South Africa.

It is a small plant, being approximately 2 cm (0.79 in) high by 10 cm (3.9 in) wide. This species is easily recognizable by its leaves which have a nearly rectangular crosssection and are arranged in two opposite rows. The leaves are grey or grey-green and are held more or less upright. The end of a leaf – the upper surface – gives the impression of having been cut (or truncated), hence the specific epithet truncata. The leaves are covered in white or grey lines with verrucosities.

In the wild, plants are often half-buried, leaving only the tips of the leaves visible above the soil. The truncated tip has a leaf window; i.e. it is translucent, allowing light to enter for photosynthesis. In this respect the species resembles Lithops, Fenestraria, and Haworthia cymbiformis.

The flowers are not very showy, emerging in white, tubular clusters on a 20 cm (7.9 in) stem.

Haworthia truncata var. maughanii (Poelln.) B.Fearn

Haworthia truncata var. truncata

In cultivation, a wide variety of cultivars have been produced, through selective breeding of varieties and through hybridisation.

This species is increasingly common in cultivation and is very easy to propagate in large numbers. It can be grown from seed, from off-sets, from root cuttings and even from leaf-cuttings. It also readily hybridises with other Haworthia species.