Oy of Mid-World is a primary character in Stephen King's magnum opus, The Dark Tower. He was introduced in the third book, The Dark Tower III: The Waste Lands, and became a member of the ka-tet for the rest of the series. Oy is a "billy-bumbler", a strange creature found in Roland Deschain's world.

The creature is a cross between a raccoon and a dog. Some billy-bumblers are very smart and can even have the capacities of humans. Oy has the ability to communicate by repeating what people say in a manner similar to that of a parrot.

There is a dispute on whether Oy has human-like sentience or merely repeats important phrases from other characters. This seems to be disproven in the final book, where Jake Chambers temporarily switches minds with him. In several crucial moments, Oy assists the human characters in getting out of danger.

King seems to base Oy's appeareance on the Tanuki, or raccoon dog. In The Waste Lands, Roland and his ka-tet stumble upon Oy alone in the woods suffering bites and cuts from what appears to have been a fight with another billy-bumbler. When Jake Chambers inquires as to what the animal is, Roland tells them about billy-bumblers in his home city of Gilead.

Oy seems very shy at first, but when Jake feeds him, he immediately falls in love with the young boy and begins to follow him around. Roland lets Jake keep Oy as a pet, as having a bumbler-bumbler supposedly brings good luck to a party. Initially, Jake simply called him "boy", which the bumbler parroted as "Oy", and the name stuck.

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