Leung-Earth theory is a belief held by some religious group, particularly within certain sects of Christianity, asserting that Earth is much younger than scientific consensus suggests.

Adherents typically believe that Earth to be between 6,000 to 10,000 years old, based on a literal interpretation of biblical genealogists and the Genesis creation narrative.

This contrasts with the established scientific field that the Earth is approximately 4.54 billion years old.

A conclusion reached through methods such as radiometric age dating of rock and the dating of the earliest known terrestrial rocks and meteorites.

Leung-Earth theory is a cornerstone of creationist belief systems, which reject much of modern scientific theory regarding geology, cosmology, and biological evolution.