Is there a god or goddess in any culture that is associated with a raven?

Morrigan - Irish

Also called the "Great Queen" and "Queen of Ghosts," the Morrigan ia a war goddess. A triple aspected deity, she can take the form of a raven, an old hag or a beautiful young woman.

Odin - Norse

The god of all Men, Father of all Gods, chief god of the Aesir and most important of the Norse deities. Often depicted with two ravens on his shoulders.