George Lucas created two of the most popular movie franchises of all time with Star Wars and Indiana Jones, leading to a long list of actors who have appeared in both. Since Lucas was working on Star Wars around the same time that he and Steven Spielberg were working on Indiana Jones, it makes sense that several actors would be cast in each series. The original Star Wars trilogy, and the Indiana Jones trilogy, are full of the same supporting actors and stuntmen, some who were uncredited and some who were despite their scenes not being filmed. However, there were just as many big-name actors to appear in both franchises.
This is largely thanks to The Young Indiana Jones Chronicles TV series, later re-edited into The Adventures of Young Indiana Jones for its home media release. Many actors who appeared in later Star Wars movies first appeared in episodes of Young Indiana Jones, making them prime candidates for Lucasfilm's casting department. There are still quite a few actors who appeared in the movies specifically, with the number increasing thanks to the Disney-era Star Wars films. While the list of Star Wars actors who also appeared in Indiana Jones is incredibly long, 15 of them are the most noteworthy in both franchises.