|Name||Jeffrey Dexter Boomhauer, Jr.|
|Relatives|| Mrs. Boomhauer (Wife)|
Patch Boomhauer (Son)
Jeff Boomhauer (Son)
|First appearance||Straight as an Arrow|
|Voiced by||Mike Judge|
Doctor Jeffrey Dexter "Doc" Boomhauer, Jr., is the father Jeff Boomhauer and the husband of Mrs. Boomhauer. Though he only made two appearances, he is mentioned frequently throughout the series. His first appearance is in Straight as an Arrow, where he is pictured as an older version of Boomhauer. His final appearance as a character is in Spin the Choice. He is also mentioned in Three Coaches and a Bobby when Boomhauer says his parents won the lottery and were living in Florida.