The 2011 National Assembly for Wales election was an election for the National Assembly. The poll was held on 5 May 2011 and decided the incumbency for all the Assembly's seats. It was the fourth election for seats in the National Assembly for Wales, and the second election taken under the rules of the Government of Wales Act 2006.

The Senedd, officially known as the Welsh Parliament in English and Senedd Cymru in Welsh, is the devolved, unicameral legislature of Wales. A democratically elected body, it makes laws for Wales, agrees to certain taxes, and scrutinises the Welsh Government. It is a bilingual institution, with both Welsh and English being the official languages of its business. From its creation in May 1999 until May 2020, the Senedd was officially known as the National Assembly for Wales and often simply called the Welsh Assembly.