Thestias or variant, may refer to:
Ixias, an alternate name for this butterfly genus Thestias (planet), an IAU-approved name for Pollux b Thestius (Θέστιος), a name originating from Greek Mythology, whose patronymic form is "Thestias"
See also
Scaptesyle thestias (S. thestias), a moth species Potamanaxas thestia (P. thestia), a butterfly species Compsodrillia thestia (C. thestia), a sea snail species Anmenopsyche thestis (A. thestis), a moth species