House M.D. did not win Outstanding Drama Series at the 2006 Primetime Emmy Awards.
The series was nominated in that category for its second season, but the award went to ABC’s Lost. House M.D. received major Emmy recognition in other categories, including acting, writing, directing, and guest performances, but it never won the top drama-series prize.
This distinction matters because House was a highly successful and heavily nominated drama. Its popularity, critical attention, and long run can lead viewers to remember it as an Outstanding Drama Series winner even though that specific award eluded the show.
The answer is therefore “None,” rather than a competing program title: the question asks what award House M.D. won in that category, and it won no such award at the 2006 ceremony.