Release Dates
| USA | 26 September 2006 | (New York City, New York) (premiere) |
| Brazil | 4 October 2006 | (Festival do Rio BR) |
| Philippines | 4 October 2006 | |
| Russia | 5 October 2006 | |
| UK | 6 October 2006 | |
| Hong Kong | 6 October 2006 | |
| Ireland | 6 October 2006 | |
| Taiwan | 6 October 2006 | |
| Ukraine | 6 October 2006 | |
| USA | 6 October 2006 | |
| Indonesia | 11 October 2006 | |
| Australia | 12 October 2006 | |
| Kazakhstan | 12 October 2006 | |
| New Zealand | 12 October 2006 | |
| Singapore | 12 October 2006 | |
| Thailand | 12 October 2006 | |
| Estonia | 13 October 2006 | |
| Latvia | 13 October 2006 | |
| Italy | 15 October 2006 | (Rome Film Festival) |
| Kuwait | 23 October 2006 | |
| Czech Republic | 26 October 2006 | |
| Bulgaria | 27 October 2006 | |
| Spain | 27 October 2006 | |
| Iceland | 27 October 2006 | |
| Italy | 27 October 2006 | |
| Poland | 27 October 2006 | |
| Israel | 2 November 2006 | |
| Malaysia | 2 November 2006 | |
| Slovakia | 2 November 2006 | |
| Norway | 3 November 2006 | |
| Romania | 3 November 2006 | |
| Serbia | 6 November 2006 | |
| Egypt | 8 November 2006 | |
| Hungary | 9 November 2006 | |
| Netherlands | 9 November 2006 | |
| Portugal | 9 November 2006 | |
| Brazil | 10 November 2006 | |
| Denmark | 10 November 2006 | |
| Finland | 10 November 2006 | |
| Argentina | 16 November 2006 | |
| Mexico | 17 November 2006 | |
| Panama | 17 November 2006 | |
| Venezuela | 17 November 2006 | |
| Iran | 18 November 2006 | |
| Greece | 23 November 2006 | |
| South Korea | 23 November 2006 | |
| Turkey | 24 November 2006 | |
| Japan | 26 November 2006 | (Tokyo International Cine City Festival) |
| France | 29 November 2006 | |
| Uruguay | 1 December 2006 | |
| Germany | 7 December 2006 | |
| Sweden | 13 December 2006 | (Lucia Movie Night) |
| Belgium | 27 December 2006 | |
| Sweden | 12 January 2007 | |
| Japan | 20 January 2007 | |
| USA | 26 January 2007 | (re-release) |
| Iran | 1 February 2007 | (Fajr International Film Festival) |
| Argentina | 22 February 2007 | (re-release) |
| Brazil | 2 March 2007 | (re-release) |
| Egypt | 7 March 2007 | (re-release) |
Also Known As (AKA)
| Argentina | Los infiltrados |
| Bulgaria (Bulgarian title) | От другата страна |
| Brazil | Os Infiltrados |
| Canada (French title) | Agents troubles |
| Czech Republic | Skrytá identita |
| Germany | Departed - Unter Feinden |
| Estonia | Kahe tule vahel |
| Spain | Infiltrados |
| Spain (Catalan title) | Infiltrats |
| France | Les infiltrés |
| Greece (transliterated ISO-LATIN-1 title) | O pliroforiodotis |
| Greece | Ο πληροφοριοδότης |
| Croatia | Pokojni |
| Hungary | A tégla |
| Israel (Hebrew title) | Ha-Shtoolim |
| Italy | The Departed - Il bene e il male |
| Japan | Dipâteddo |
| Lithuania | Infiltruoti |
| Mexico | Los infiltrados |
| Peru | Los infiltrados |
| Poland | Infiltracja |
| Portugal | The Departed - Entre Inimigos |
| Romania | Cartita |
| Serbia | Dvostruka igra |
| Russia | Отступники |
| Sweden | The Departed |
| Slovenia | Dvojna igra |
| Slovakia | Na druhej strane |
| Thailand (Thai title) | Parakit hoad faengtua koan chaopho |
| Turkey (Turkish title) | Köstebek |
| Ukraine | Вiдступники |
| Uruguay | Los infiltrados |
| Venezuela | Infiltrados |