William Holder (birth unknown – 22 August 1941) was an English rugby union, and professional rugby league footballer who played in the 1900s and 1910s. He played club level rugby union (RU) for Gloucester RFC, and representative level rugby league (RL) for Great Britain and England, and at club level for Hull FC, as a forward (prior to the specialist positions of; prop, hooker, second-row, loose forward), during the era of contested scrums.