In going through some of the credits for the Young Indiana Jones Chronicles, I noticed some familiar names. Here's a list of credited Star Wars actors who have appeared in the Indiana Jones movies and/or television series:

Anthony Daniels (C-3PO): Francois
Bruce Boa (General Rieekan): Ambassador Kerens
Christopher Lee (Count Dooku): Count Ottokar Graf Czernin
Harrison Ford (Han Solo): Dr. Henry 'Indiana' Jones, Jr.
Ian McDiarmid (Emperor Palpatine): Professor Levi
Jerry Harte (Romas "Lock" Navander"): Professor Stanton
Julian Glover (General Veers): Walter Donovan
Michael Sheard (Admiral Ozzel): Adolph Hitler
Pernilla August (Shmi Skywalker): Emiliel, Mamma
William Hootkins (Porkins): Major Eaton, Diaghilev