Emlyn Jenkins (1 December 1910 – October 1993) was a Welsh rugby union and professional rugby league footballer of the 1930s and '40s, and coach of the 1950s, playing club level rugby union (RU) for Treorchy RFC, and Cardiff RFC, and representative level rugby league (RL) for Great Britain, Wales, and England, and at club level for Salford (twice), Wigan and St. Helens (twice), as a fullback, wing, centre, stand-off/five-eighth, or scrum-half/halfback, i.e. number 1, 2 or 5, 3 or 4, 6, or 7, and coaching club level rugby league (RL) for St. Helens.
At the height of his success, Jenkins was considered a rare genius at rugby league football.
Emlyn Jenkins won 4 caps for Wales in 1932–1936 while at Salford, won caps for England while at Salford in 1934 against Australia and France, and won caps for Great Britain while at Salford in 1933 against Australia, in 1936 against Australia (3 matches) and New Zealand (2 matches), and in 1937 against Australia (3 matches).
Only four rugby league footballers have played initially for Wales, and then subsequently for England, they are; Emlyn Jenkins, Gus Risman, Jim Sullivan and Les White.
Emlyn Jenkins was one of the players who successfully toured in France with Salford in 1934, during which the Salford team earned the name "Les Diables Rouges", the seventeen players were; Joe Bradbury, Bob Brown, Aubrey Casewell, Paddy Dalton, Bert Day, Cliff Evans, Jack Feetham, George Harris, Barney Hudson, Emlyn Jenkins, Alf Middleton, Sammy Miller, Harold Osbaldestin, Les Pearson, Gus Risman, Billy Watkins, and Billy Williams.
During Emlyn Jenkins time there was Salford's victories in the Championship in 1932–33 season, 1936–37 season, and 1938–39 season, the 1938 Challenge Cup in 1937–38 season, the Lancashire Cup in the 1929–30 season, 1931–32 season, 1934–35 season, 1935–36 season, and 1936–37 season, and the Lancashire League during the 1932–33 season, 1933–34 season, 1934–35 season, 1936–37 season and 1938–39 season.
Emlyn Jenkins made his debut for Wigan in the 19-3 victory over Newcastle (away) on Saturday 12 March 1938, he scored his first Wigan try in the 16-13 victory over Leeds at Central Park, Wigan on Saturday 19 March 1938, he scored his last Wigan try in the 12-8 victory over Swinton in Round-1 of the Lancashire Cup at Central Park, Wigan on Saturday 10 September 1938, he played his last Wigan match in the 19-0 victory over Leigh at Mather Lane, Leigh on Saturday 8 October 1938.
Emlyn Jenkins played for St. Helens as a guest from Salford during the Wartime Emergency Leagues, and played fullback in St. Helens' 45-38 victory over the Rugby League Players' Union in the Testimonial match for St. Helens wing Albert 'Sonny' Doyle  at Knowsley Road, St. Helens on Monday 30 April 1951.
Emlyn Jenkins played stand-off/five-eighth in Salford's 3-15 defeat by Wigan in the Championship final during the 1933–34 season at Wilderspool, Warrington on Saturday 28 April 1934.
About Emlyn Jenkins' time, there was Salford's 2-15 defeat by Warrington in the 1929 Lancashire Cup final during the 1929–30 season at Central Park, Wigan on Saturday 23 November 1929, the 10-8 victory over Swinton in the 1931 Lancashire Cup final during the 1931–32 season at the Cliff, Broughton, Salford on Saturday 21 November 1931, the 21-12 victory over Wigan in the 1934 Lancashire Cup final during the 1934–35 season at Station Road, Swinton on Saturday 20 October 1934, the 15-7 victory over Wigan in the 1935 Lancashire Cup final during the 1935–36 season at Wilderspool, Warrington on Saturday 19 October 1935, the 5-2 victory over Wigan in the 1936 Lancashire Cup final during the 1936–37 season at Wilderspool, Warrington on Saturday 17 October 1936.