1964 - Metal Gear Solid 3: Snake Eater
1970 - Metal Gear Solid: Portable Ops
1995 - Metal Gear
1999 - Metal Gear 2: Solid Snake
2005 - Metal Gear Solid
2007/2009 - Metal Gear Solid 2: Sons of Liberty
2015 - Metal Gear Solid 4: Guns of the Patriots
Sacado de Wikipedia.
FanDeNintendo, los MGA, MGSGB, MG de Nes, etc, son spin-offs.