State Senator R. Clayton "Clay" Davis is a fictional character on the HBO drama The Wire, played by actor Isiah Whitlock, Jr. Davis is a corrupt Maryland State Senator with a reputation for pocketing bribes. However, throughout the series Davis remains protected by other ranking politicians and Police Commissioner Ervin Burrell.

Davis was known for his idiosyncratic profanity, often when confronted with bad news, comically elongating the word "shit" as "sheeeeee-it."

These are summaries of events depicted in Davis' career in each season of the television show:

When Lt. Cedric Daniels' detail discovers $20,000 of Avon Barksdale's drug money in the car of Davis's driver, they try to expand the wiretap-based investigation to include Davis. Deputy Commissioner Ervin Burrell calls Daniels into a private meeting with Davis, pressuring him into excluding the senator's alleged involvement. However, Daniels is unwilling to drop the case. Nevertheless, Burell pulls the plug on the investigation, and Clay Davis's involvement is effectively left buried. However, it is mentioned that Davis has a reputation for taking bribes, and has been under federal investigation for the last two years.