Nathaniel is a character in Jonathan Stroud's Bartimaeus Trilogy. Nathaniel is one of the main characters of this series. After coming of age as a magician when he was 12 years old, he was granted the new name of "John Mandrake," and is known by this name to everyone but the title character, Bartimaeus.

The Most Reverend Dr. Nathaniel (Popp) (b. June 12, 1940) is an American Romanian Orthodox clergyman, the current archbishop of the Orthodox Church in America's Romanian Episcopate.