In Ancient Egyptian mythology, the world is divided into forces of order against chaos. The ultimate chaos god is Apophis, a monstrous serpent and God of Evil who wants nothing more than to destroy the universe. Set was originally a positive god of chaos, deserts and storms, but was later demonized into a God of Evil. Despite this, he still hated and opposed Apophis.
Japanese Mythology has two opposing "forces" which make up all of creation, including man, spirits, nature and kami: the nigi-mitama and ara-mitama. While not considered "sentient" gods or forces in their own right, they are nonetheless all-encompassing. Nigi-mitama is the force that creates harmony while the ara-mitama is the force that invokes anger, violence, conflict and chaos.
Some forms of theistic Satanism believe Satan to be a chaotic entity, but in a positive way as the true liberator of the chains of the Cosmic reality created by God. Others believe there were seven gods of Chaos who existed before Yaweh, sometimes called Leviathans (based on a part of Psalms that says that God fought the Leviathan in order to create the Universe, and another part of Genesis were it says that the waters existed before God created Earth).