The Nome King is a fictional character created by American author L. Frank Baum. He is introduced in Baum's third Oz book Ozma of Oz (1907). He also appears in many of the continuing sequel Oz novels also written by Baum. Although the character of the Wicked Witch of the West is the most notable and famous Oz villain, it is actually the Nome King who is the most frequent antagonist throughout the entire book series.

Ozma of Oz, published on July 30, 1907, was the third book of L. Frank Baum's Oz series. It was the first in which Baum was clearly intending a series of Oz books.