Release Dates
| France | 25 May 2007 | (Cannes Film Festival) |
| France | 30 May 2007 | |
| Belgium | 6 June 2007 | |
| Canada | 10 August 2007 | (French speaking region) |
| Canada | 10 September 2007 | (Toronto International Film Festival) |
| Germany | 13 September 2007 | |
| Denmark | 23 September 2007 | (Copenhagen International Film Festival) |
| Brazil | 28 September 2007 | (Festival of Rio) |
| Israel | 28 September 2007 | (Haifa Film Festival) |
| USA | October 2007 | (Chicago International Film Festival) |
| USA | 7 October 2007 | (New York Film Festival) |
| Canada | 9 October 2007 | (limited) |
| UK | 23 October 2007 | (London Film Festival) |
| Russia | 1 November 2007 | (limited) |
| USA | 3 November 2007 | (AFI Film Festival) |
| USA | 10 November 2007 | (Starz Denver Film Festival) |
| Australia | 15 November 2007 | |
| Argentina | 18 November 2007 | (San Luis Cine International Festival) |
| Turkey | 30 November 2007 | |
| UK | 18 February 2008 | (Glasgow Film Festival) |
| Serbia | 26 February 2008 | (Belgrade Film Festival) |
| UK | 7 March 2008 | (Birds Eye View Film Festival) |
| UK | 11 April 2008 | |
| UK | 16 April 2008 | (Belfast Film Festival) |
| USA | 24 April 2008 | (San Francisco International Film Festival) |
| Mexico | 4 May 2008 | (Festival Internacional de Cine Acapulco) |
| USA | 23 May 2008 | (Seattle International Film Festival) |
| USA | 18 June 2008 | (CineVegas International Film Festival) |
| Brazil | 27 June 2008 | |
| USA | 27 June 2008 | (limited) |
| USA | 18 July 2008 | |
| South Korea | 31 July 2008 | |
| Japan | 17 October 2008 | (DVD premiere) |
| Mexico | 28 November 2008 | |
| Sweden | 25 April 2010 | (TV premiere) |
Also Known As (AKA)
| (original title) | Une vieille maîtresse |
| Argentina (festival title) | Una vieja amante |
| Australia (new title) | An Old Mistress |
| Bulgaria (Bulgarian title) | Последната любовница |
| Brazil | A Última Amante |
| Brazil (festival title) | Uma Velha Amante |
| Canada (English title) | The Last Mistress |
| Germany (TV title) | Die letzte Mätresse |
| Germany | Die letzte Mätresse |
| Greece (DVD title) | I eromeni |
| Hungary | Az utolsó úrnő |
| Italy | Une vieille maîtresse |
| Japan (English title) (literal English title) | Last Mistress |
| Japan | Saigo no aijin |
| Poland | Stara kochanka |
| Portugal | A Última Amante |
| Serbia | Bivša ljubavnica |
| Russia | Тайная любовница |
| Turkey (Turkish title) | Metres |
| USA (new title) | The Last Mistress |
