William George "Rosey" Rosenbaum (December 17, 1889 – January 12, 1949) was an American politician.
Born in Owensboro, Kentucky, Rosenbaum moved to Arizona Territory, in 1911, because of health problems.
He worked at a mine mill in Hayden, Arizona and was the foreman and was a pharmacist.
He served in the United States Army during World War I.
His wife Polly Rosenbaum was appointed to his seat after his death.