| Country | Date | |
|---|---|---|
| USA | 10 September 1993 | |
| Denmark | 3 January 1994 | |
| UK | 26 January 1994 | |
| Australia | 10 February 1994 | |
| Spain | 7 March 1994 | |
| France | 12 June 1994 | |
| Germany | 5 September 1994 | |
| Switzerland | 19 September 1994 | (French speaking region) |
| Korea | 31 October 1994 | |
| Hungary | 25 November 1994 | |
| Finland | 31 January 1995 | |
| Taiwan | 18 February 1995 | |
| Argentina | 6 May 1995 | |
| Slovenia | 15 December 1995 | |
| Poland | 20 March 1996 | |
| Croatia | 19 October 1996 | |
| Russia | January 1997 | |
| Finland | 30 May 2005 | (re-release) |
| "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 |
| "Aux frontières du réel" | France |
| "Código X" | Argentina |
| "Dosjei X" | Croatia |
| "Expediente X" | Spain |
| "Ficheiros Secretos" | Portugal |
| "Files in the Dark" | Israel (literal English title) (Hebrew title) |
| "Salaiset kansiot" | Finland |
| "Salatoimikud" | Estonia |
| "Strengt fortroligt" | Denmark |
| "The X Files" | Greece |
| "The X-Files" | USA |
| "X Files" | France |
| "X Files, aux frontières du réel" | France |
| "X-Fairu" | Japan |
| "X-File" | Japan (English title) |
| "X-Files" | Italy |
| "X-akták" | Hungary |
| "Z archiwum X" | Poland |
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