The Avengers - 1998 was released on:
Israel: 13 August 1998
Canada: 14 August 1998
Ireland: 14 August 1998
Malaysia: 14 August 1998
South Africa: 14 August 1998
Sweden: 14 August 1998
UK: 14 August 1998
USA: 14 August 1998
France: 19 August 1998
Singapore: 20 August 1998
Belgium: 26 August 1998
Germany: 27 August 1998
Austria: 28 August 1998
Brazil: 28 August 1998
Switzerland: 28 August 1998 (German speaking region)
Netherlands: 3 September 1998
Finland: 4 September 1998
Portugal: 4 September 1998
Philippines: 9 September 1998 (Manila)
Taiwan: 11 September 1998
Thailand: 11 September 1998
Slovenia: 17 September 1998
Denmark: 18 September 1998
Greece: 23 September 1998
Philippines: 23 September 1998 (Davao)
New Zealand: 24 September 1998
Mexico: 25 September 1998
Spain: 25 September 1998
Kuwait: 30 September 1998
Turkey: 2 October 1998
Japan: 3 October 1998
South Korea: 3 October 1998
Slovakia: 8 October 1998
Poland: 9 October 1998
Hungary: 15 October 1998
Italy: 30 October 1998
Australia: 5 November 1998
Estonia: 6 November 1998
Iceland: 13 November 1998
Indonesia: 28 November 1998 (Jakarta)
Argentina: 20 January 1999 (video premiere)
Alien Avengers II - 1998 TV was released on: USA: 28 July 1998 (video premiere)
Alien Avengers II - 1998 - TV was released on: USA: 28 July 1998 (video premiere)
HBO First Look - 1992 The Avengers 5-9 was released on: USA: August 1998
Bully Avengers - 2011 was released on: USA: August 2011
The Avengers - 1961 The Hour That Never Was 4-9 was released on: UK: 27 November 1965 USA: 25 April 1966 Germany: 10 December 1998
The Avengers Unhulked - 2013 was released on: USA: 26 February 2013 (internet)
The Avengers - 1961 The House That Jack Built 4-23 was released on: UK: 5 March 1966 USA: 16 May 1966 Germany: 31 December 1998
Marvel's Avengers Assemble - 2013 Avengers Impossible 1-12 was released on: USA: 20 October 2013
Avengers Assemble - 2010 Baywatch was released on: USA: 3 January 2014
The Avengers vs- The Economy - 2012 was released on: USA: 14 May 2012
There is an upcoming film 'The Avengers' with a release date of May 4, 2012 . If you are referring to the 1960s 'The Avengers' there was a 1998 film of the same name starring Uma Thurman based upon the TV series .
The Avengers Earth's Mightiest Heroes - 2010 Avengers Assemble 2-26 was released on: USA: 11 November 2012