| "The X Files" |
USA (original title) |
| "Akte X - Die unheimlichen Fälle des FBI" |
Austria / Germany |
| "Los expedientes secretos X" |
Mexico / Peru |
| "Досиетата X" |
Bulgaria (Bulgarian title) |
| "Секретные материалы" |
Russia |
| "Akte X" |
Germany |
| "Arkiv X" |
Sweden |
| "Arquivo X" |
Brazil |
| "Código X" |
Argentina |
| "Dosije iks" |
Serbia (imdb display title) |
| "Dosjei X" |
Croatia |
| "Dosjeji X" |
Slovenia |
| "Expediente X" |
Spain |
| "Ficheiros Secretos" |
Portugal |
| "Files in the Dark" |
Israel (literal English title) (Hebrew title) |
| "Gizli Dosyalar" |
Turkey (imdb display title) (Turkish title) |
| "Los Expedientes Secretos X" |
Venezuela (complete title) |
| "Salaiset kansiot" |
Finland |
| "Salatoimikud" |
Estonia |
| "Strengt fortroligt" |
Denmark |
| "The X Files" |
Greece |
| "The X-Files" |
USA |
| "X Files: aux frontières du réel" |
France (imdb display title) |
| "X-Fairu" |
Japan |
| "X-File" |
Japan (English title) |
| "X-Files" |
Italy |
| "X-akták" |
Hungary |
| "Z archiwum X" |
Poland |