斯诺登山（英语：Snowdon；威尔斯语：Yr Wyddfa，国际音标：/ɐɾ 'wɪðva/），海拔1,085米（3560英尺），相对高度1038米，威尔斯第一高山，英国第二高山，不列颠群岛第2高山，位于威尔斯圭内斯郡斯诺登尼亚（Snowdonia）国家公园内。「Yr Wyddfa」在威尔斯文解作「钟状山」。该山接近爱尔兰海，山上有多种动物，是旅游胜地，邻近威尔士的著名的城市卡那封（Caernarfon），山下有登山火车直达山上。

Snowdon (Welsh:Yr Wyddfa, pronounced [əɾ ˈwɨ̞ðva]) is the highest mountain in Wales, at an elevation of 1,085 metres (3,560 ft) above sea level, and the highest point in the British Isles outside the Scottish Highlands. It is located in Snowdonia National Park (Parc Cenedlaethol Eryri) in Gwynedd, and has been described as "probably the busiest mountain in Britain". It is designated as a national nature reserve for its rare flora and fauna.