Frank Wrentmore (birth registered during fourth ¼ 1884 in Pontypridd) was a Welsh rugby union, and professional rugby league footballer who played in the 1900s. He played club level rugby union (RU) for Penygraig RFC, and club level rugby league (RL) for Mid-Rhondda, he served with the Somerset Light Infantry with the British Expeditionary Force in World War I.