Bigger Luke, commonly abbreviated to BL, or more uncommonly BgL, is the slightly larger manifestation of Luke Skywalker that is said to appear in certain scenes of the original Star Wars Trilogy, contrasting to Regular Luke.

There have been many elaborate theories as to why there exists a larger version of Luke Skywalker in the original Star Wars films, however most theories fall into two general categories:

The Canon Luke Hypothesis, sometimes simply The Bigger Luke Hypothesis, in which it is theorized that within the Star Wars universe and canon there does indeed exist a version of Luke Skywalker that is slightly larger than a posited regular Luke Skywalker, or Luke Prime.

The Hamill Hypothesis, in which it is theorized that there exists an uncredited Mark Hamill look-alike who was used in certain scenes of the original trilogy for undisclosed reasons and whose identity has yet to be determined.