Omniscience

Omniscience is the ability to have unlimited understanding and awareness of everything. We have yet to see a being with this power.

Omniscience
No character in the Supernatural Universe is omniscient.

Nigh-Omniscience
Entities who have an awareness of anything that goes around in the universe and know almost anything


 * God - God knows almost everything, Joshua once said to the Winchesters that he already knows everything they want to tell him. Although Death claims that God has forgotten who is older. However, this hasn't been supported. Metatron also states God did not know the name of multiple people who worshiped him. In his defense, it should be noted that, Chuck, an incarnation of God, was never wrong. Things even alternated to fit with his predictions.
 * Death - He is almost omniscient, but was wrong on some occasions.
 * Archangels - All Archangels possess a heightened awareness and perception of what's going on all around the universe. Michael and Lucifer recognized the release of The Darkness although they were in the cage. They are older than the universe makeing them present at the time he was created and they can see on the future as well in some point but not always right about it.
 * Michael - Michael, being the first Archangel in creation, possesses a phenomenal understanding of the universe. His knowledge surpasses even Lucifer's. He was even aware of Anna Milton's plan, and picked just the right moment to throw it off the rails.
 * Lucifer - Lucifer, being the second Archangel in creation, possesses a profound understanding of the universe. As Sam once said to Dean "I'm sure he knows a buttload we don't", however he didn't know the car that Dean and Sam drive.
 * Raphael - Raphael's knowledge, being an Archangel, was incredible. He knew of a way to open Lucifer's Cage, without the Horsemen's rings.
 * Gabriel - Gabriel, although the youngest Archangel, possesses great knowledge of the universe. He also possessed knowledge of the four Horseman rings and that they can open Lucifer's Cage.

Cosmic Awareness
Cosmic awareness is the ability to know, and understand, what's transpiring across the universe, and it's fluctuations and changes.


 * The Darkness - Being older than God himself, the Darkness knows many things, and is still learning about the universe God made while she was locked away. However, she was immediately able to speak the English language.


 * Metatron - As the scribe of God, he wrote several words of God about various beings, has knowledge of many creatures including demons, angels and leviathans.
 * Eve - A very old entity, Eve, the Mother of All, possess a strong understanding of the universe. She bears some knowledge and insight on the Natural Order, and the roles she and her children play in it.

Limited Cosmic Awareness
A more milder, limited form of a type of cosmic awareness. While, not as intelligent as those with full cosmic awareness, these beings are far more intelligent that those with bare superhuman intellect.


 * Angels (Collectively all branches of angels besides the archangels) - All angels understand and know many things, such as all possible Prophets.
 * Reapers - As the ones responsible for taking souls to the spiritual realms like Heaven, Hell, and possibly Purgatory, reapers are far more intelligent than most beings.
 * War, Famine and Pestilence - Horseman have incredible knowledge and understand many things.
 * Pagan gods - The pagans have a higher awareness of the world and the natural order. During the events of season 5, many pagan gods gathered to discuss the Judeo-Christian apocalypse and knew details demons didn't know before it began. Ex. Sam and Dean being Lucifer and Michael's true vessels. Also, Atropos a god employed by Heaven uses her powers to determine the fate of humans.

Superhuman intelligence
This is the ability to know or understand more than is humanely possible, but not to the point of total awareness.


 * Leviathan - Being born at the dawn of time, they are highly intelligent.
 * Demons - Demons possess higher forms of knowledge.
 * Seven Deadly Sins
 * Dr. Visyak