Preseli Pembrokeshire is a constituency of the Senedd. It elects one Member of the Senedd by the first past the post method of election. It is also one of eight constituencies in the Mid and West Wales electoral region, which elects four additional members, in addition to eight constituency members, to produce a degree of proportional representation for the region as a whole.

The 2007 National Assembly for Wales election was held on Thursday 3 May 2007 to elect members to the National Assembly for Wales. It was the third general election. On the same day local elections in England and Scotland, as well as the Scottish Parliament election took place. This election was preceded by the previous Assembly election in 2003.