William "Bill" 'Ernie' H. Hopper (birth registered fourth ¼ 1922^[2] – September 2008) was a Welsh professional rugby league footballer who played in the 1940s and 1950s. He played at representative level for Wales, and at club level for Warrington (Heritage No.), and Leeds, as a prop, i.e. number 8 or 10, during the era of contested scrums.^[1][3][4]

William Hopper's birth was registered in Bridgend, Wales, and he died aged 85 in Castleford, England.

Bill Hopper's marriage to Patricia (née Thorpe) was registered during first ¼ 1951 in Leeds district.^[5] They had children; Miriam Hopper (birth registered during fourth ¼ 1951 (age 72–73) in Leeds district), and Haydn E. W. Hopper (birth registered during second ¼ 1954 (age 69–70) in Leeds district).