A Slavic dragon is any dragon in Slavic mythology, including the Russian zmei (or zmey; змей), Ukrainian zmiy (змій), and its counterparts in other Slavic cultures: the Bulgarian zmey (змей), the Slovak drak and šarkan, Czech drak, Polish żmij, the Serbo-Croatian zmaj (змај), the Macedonian zmej (змеј) and the Slovene zmaj. The Romanian zmeu could also be deemed a "Slavic" dragon, but a non-cognate etymology has been proposed.

A zmei may be beast-like or human-like, sometimes wooing women, but often plays the role of chief antagonist in Russian literature. In the Balkans, the zmei type is overall regarded as benevolent, as opposed to malevolent dragons known variously as lamia, ala or hala, or aždaja.

The Polish smok (e.g. Wawel Dragon of Kraków) or the Ukrainian or Belarusian smok (смок), tsmok (цмок), can also be included. In some Slavic traditions smok is an ordinary snake which may turn into a dragon with age.

Some of the common motifs concerning Slavic dragons include their identification as masters of weather or water source; that they start life as snakes; and that both the male and female can be romantically involved with humans.