X-COM games in order

All 11 games of the X-COM series in the order they came out, from UFO: Enemy Unknown (1994) to XCOM: Chimera Squad (2020).

1. 
   UFO: Enemy UnknownAmiga 1200, DOS, CD32 +3 · Mythos Games
   85Mar 1994
2. 
   X-COM: Terror from the Deep3DO, DOS, PS1 +1 · MicroProse
   781995
3. 
   X-COM: ApocalypsePC, DOS · Mythos Games
   7630 Jun
4. 
   X-COM: InterceptorPC · MicroProse
   15 Jun
5. 
   X-COMPC · Hasbro Interactive
   30 Sep
6. 
   X-COM: EnforcerPC · MicroProse
   18 Apr
7. 
   XCOM: Enemy UnknownPC, PS3, Xbox 360 +4 · Feral Interactive, Firaxis Games
   919 Oct
8. 
   The Bureau: XCOM DeclassifiedXbox 360, PC, Mac +1 · 2K Marin
   696 Aug
9. 
   XCOM: Enemy WithinPC, Mac, iOS +4 · Firaxis Games
   8612 Nov
10. 
    XCOM 2PC, Mac, Linux +3 · Feral Interactive, Firaxis Games
    874 Feb
11. 
    XCOM: Chimera SquadPC · Firaxis Games
    7824 Apr