This article is a list of collectible dog tags in Metal Gear Solid 2: Sons of Liberty. These are bonus items in the game, which can be obtained by holding up enemy soldiers, and pointing an equipped gun to their head or groin. On the higher difficulty levels, some soldiers will not give up their dog tags so easily; to obtain them, the player must discharge their weapon or use a big gun like the RGB6 or Stinger in order to "persuade" them.
In Metal Gear Solid 2: Substance, the player has the option to choose between two sets of dog tags to collect, when starting a new game: one that includes the name, blood type, and date of birth information as featured in the original Sons of Liberty (2001), or one that includes different names and personal information (2002). Besides the change in listed information, the tags are otherwise identical in terms of gameplay.