The Halo series first game was Halo: Combat Evolved released on 15th November 2001.
2001
Halo: Combat Evolved
15th November 2001
2004
Halo 2
9th November 2004
2007
Halo 3
25th September 2007
2009
Halo Wars
26th February 2009
Halo 3: ODST
22nd September 2009
2010
Halo 2600
8th July 2010
Halo: Reach
14th September 2010
2011
Halo: Combat Evolved Anniversary
15th November 2011
2012
Halo 4
6th November 2012
2013
Halo: Spartan Assault
24th December 2013
2014
31st January 2014
Halo: The Master Chief Collection
11th November 2014
2015
Halo 5: Guardians
27th October 2015
2017
Halo Wars 2
21st February 2017
Halo Wars: Definitive Edition
20th April 2017
2021
Halo Infinite
31st December 2021