William James Dwyer (9 May 1887 – 10 May 1951) was an Irish politician and businessman. He was born 9 May 1887 in Cork city, second son among three sons and two daughters of Walter Dwyer of Sunday's Well, Cork, merchant and later director and managing director of Dwyer & Co., and Clare Dwyer (née Downing). He was educated at Presentation Brothers College, Cork; and Downside School, Somerset, England. He married Agnes Harding in 1912, and they had one son and three daughters. He died on 10 May 1951 at the Bon Secours nursing home in Cork.