In House M.D., what is the name of Dr. House’s closest friend and colleague?

James Wilson is Dr. House’s closest friend and colleague in House M.D.

Dr. James Wilson, played by Robert Sean Leonard, is the head of the fictional hospital’s Department of Oncology. His compassionate personality contrasts with House’s bluntness and skepticism, making him a stabilizing presence in both the hospital and House’s personal life.

Wilson repeatedly helps House navigate professional conflicts, relationships, and the consequences of his addiction to Vicodin. Although he often criticizes House’s behavior, he remains unusually loyal and understands House better than most of the other characters.

The friendship also drives several major storylines, including Wilson’s relationships and his eventual cancer diagnosis. Their bond is central to the series finale, which focuses heavily on what their friendship means after years of conflict and dependence.