Festo (disambiguation) language used Esperanto
FESTO (Esperanto meeting), a yearly French Esperanto meeting organized by Espéranto-Jeunes
Festo, German automation company
Festo, Porcio Festo, was the Roman procurator of Iudaea Province, in succession to Antonius Felix
Festo Corp. v. Shoketsu Kinzoku Kogyo Kabushiki Co., a landmark patent-law case
language spoken official language linguistic usage dialect spoken vernacular employed