威尔斯国民代表大会（英语：National Assembly for Wales，简写为：NAW或NAfW，威尔斯语：Cynulliad Cenedlaethol Cymru，简写为：CCC，) ，是由1997年威尔斯权力下放公民投票（Wales referendum 1997）后，英国国会通过《1998年威尔斯地方政府法案》（Government of Wales Act 1998）时实现。 除了英国保守党之外，威尔斯各政党、社会各界全部赞成权力放下，兼成立威尔斯国民议会及其行政机关。 威尔斯国民代表大会大楼被称为Senedd。

The National Assembly for Wales (Welsh:Cynulliad Cenedlaethol Cymru) is a devolved assembly with power to make legislation in Wales. It is commonly also known as the Welsh Assembly. The Assembly comprises 60 members, who are known as Assembly Members, or AMs (Aelod y Cynulliad). Since 2011, Members are elected for five-year terms under an additional members system, where 40 AMs represent geographical constituencies elected by the plurality system, and 20 AMs represent five electoral regions using the d'Hondt method of proportional representation.