Immortals are beings that are immune to all weapons and any kind of damage, including that which would easily kill a mortal. Gods and certain magical creatures are immortal, unable to die by the passage of time, immune to all human and supernatural diseases, and able to survive damage that would easily destroy a human. It must be noted however that a sufficient injury from certain sources can still kill them.

Most Greek Gods, Norse Gods, and some monsters fall under this category. Some of them, however still age until they achieve their Immortality and once achieved do not age.

In the God of War Series

Many Immortal beings are encountered through the God of War series, including gods and titans. However, being Immortal in the God of War universe means safety only from natural death. Due to their eternal lifespans, gods and titans could only be killed by the power of other immortals. Such as fellow gods and titans, demigods (if powerful enough) or weapons holding godly power such as the Blade of Olympus, the Gauntlet of Zeus, the Blade of the Gods, and most notably, the power of Hope.

However, through the use of Vanir magic, it is possible for a god to become truly immortal in the sense that killing them becomes impossible due to a spell that makes them deathless. The cost of this absolute invulnerability is that the one who obtains it will be unable to feel, taste or smell - making it so that things like drinking, feasting and even temperature are nullified to the user, ironically making it so that they feel as if they aren't alive without any sensory input, being incapable of feeling pain as well as pleasure. This was done to Baldur by his mother, Freya, who became worried when she learned of a prophecy that her son would die a needless death that would begin the three-year long Fimbulwinter that would pave way for Ragnarök. The only way to remove the curse is through the affected making contact with mistletoe.

The more powerful the Immortal, the more difficult it proved to kill them. Zeus, for instance, survived multiple stab wounds inflicted with the Blade of Olympus, one of the only weapons capable of dispatching gods that also killed Athena with just one stab, while the numerous undead soldiers fought by Kratos fell by the dozens to almost any weapon he used.

The majority of the immortal beings in the series are listed below:

• Primordial Gods: Ancient, cosmic deities that created the Earth and universe, thought to be the first and most powerful of immortal species.
• Titan Gods: A race of elemental giants descending from the Primordials that reigned during the Golden Age of Mankind, and birthed the gods who eventually overthrew them.
• Olympian Gods: The descendants of the Titans and the rulers of Greece prior to the events of the Second Great War, where most were slain by Kratos. 
• Norse Gods: Descendants of the Primordial Jotnar Ymir and rulers of Asgard and Vanaheim. Separated between the warlike Aesir and the pacifistic Vanir. 
• The Valkyries: A mysterious race of winged female warriors of unknown origin. They were given the job of escorting the great heroes who had died in battle to Valhalla by Odin.  
• The Furies: An independent race of three female beings that came to be after the war of the Primordials; Megaera, Alecto, and Tisiphone were each immortal yet were all slain by Kratos to break his blood oath with Ares.
• Users of the Ambrosia: Any who consume the divine Ambrosia are stated to attain immortality. The exact number of its users is unknown and all of Ambrosia's users are children of Atlas and Themis.
• Pandora: The female humanoid entity who served as the key to Pandora's Box, created by Hephaestus and seen as his adoptive daughter. As she was created to be the key to Pandora's Box, she is as old as the box itself which has been around for over a thousand years. Yet, she could be killed by sacrificing herself to exstinguish the Flame of Olympus, which she did in God of War III to help Kratos defeat Zeus.

Trivia

• Although unable to die because of eternal servitude to their masters, the undead are mistakenly thought to be Immortal. Whilst they too cannot die through common means, the undead is not thought of as Immortals, since they cannot die, and the undead has died once before. Charon is one of the most notable of all undead characters.