John "Johnny"/"Johny" Thomas (c. 1881 – 25 September 1954) was a Welsh rugby union, and professional rugby league footballer who played in the 1900s, 1910s and 1920s. He played representative level rugby union (RU) for Glamorgan and Monmouthshire, and at club level for Maesteg RFC and Cardiff RFC, as a full-back or scrum-half, i.e. number 15, or 9, and representative level rugby league (RL) for Great Britain, Wales, and Lancashire, and at club level for Wigan, as a stand-off or scrum-half, i.e. number 6 (number 10 in a 15-player team), or 7 (number 9 in a 15-player team).