Tsohon Latin yana nufin yaren Latin kamar yadda ake magana da kuma rubuta shi a cikin lokaci daga farkon sanannun rubutun Latin a cikin karni na 7 BC har zuwa ƙarshen karni na 2 BC. Ana la'akari da mafi tsufa mataki na harshen Latin, wanda ya wuce Latin Classical. Kalmar “Tsohon Latin” ana amfani da ita don bambance wannan farkon nau’in Latin daga mataki na gaba na harshe, gami da Latin Classical, Latin Medieval, da Latin Modern.