Egghead Jr. is a character in the animated cartoon Looney Tunes, created by Robert McKimson in the 1950s. He debuted in 1954's Little Boy Boo and made his only speaking appearance in the 1959 cartoon A Broken Leghorn, wherein he speaks somewhat like Tweety Bird. Therein his voice is provided by Mel Blanc.

Egghead Jr. is a large-headed and very intelligent baby chick and appeared in several shorts with bumptuous Foghorn Leghorn (also a character directed by McKimson and voiced by Blanc). The only child of Miss Prissy, a spinster hen who inexplicably became a widow in later shorts, Egghead Jr. was bookish and, other than in A Broken Leghorn, never talked (though he mumbled when he counted playing hide-and-seek with Foghorn in Little Boy Boo). Foghorn would try to teach him to be a man and play real games like baseball and cowboys and Indians...invariably resulting in bodily injury...for Foghorn.