Tabasaran (also written Tabassaran) is a Northeast Caucasian language of the Lezgic branch.

It is spoken by the Tabasaran people in the southern part of the Russian Republic of Dagestan.

It is highly probable that Tabasaran is an active language of the fluid-S type.

Hjelmslev (1935) claimed that Tabasaran had the 'empirical maximum' number of cases, with 52 (though 2 occur only on adjectives).

However, such claims are based on a sloppy analysis of 'case', and other languages such as Tsez would have even larger counts under such definitions.

The ergative, which may be irregular but typically ends in -i, functions as the stem for all other cases.

There are also 7 or 8 locative case suffixes: -ʔ 'in', -xy 'at', -h 'near / in front' (neutralized with 'at' in the south), -ʔin 'on' (horizontal), -k 'on' (vertical), -kk 'under', -q 'behind' and -ghy 'among'.

The locative cases may take an additional suffix, allative -na or ablative -an, for 21 or 24 combinations.