|Full name||Ynysddu Rugby Football Club|
|Ground(s)||The Welfare Ground|
|League(s)||WRU Division two East|
Ynysddu RFC's first recorded match was against Abercarn in 1884 and was played on the church field at Mynyddislwyn. The club originally played in an all black strip until the 1920s when they switched to a red and black hooped kit.