An election to Preseli Pembrokeshire District Council was held in May 1991. The Independent councilors retained the vast majority of seats. It was preceded by the 1987 election and followed, after local government re-organization, by the 1995 Pembrokeshire County Council election. On the same day there were elections to the other district local authorities and community councils in Wales.
There were no boundary changes at this election.
No election was held as the sitting member, Jack Lewis, was unopposed; however, he died before polling day.
Affie Webb lost his seat after the drawing of lots.
An Independent had gained a seat from the Liberal Democrats at a by-election.
No election was held as no nominations were submitted.
A by-election was held in the Burton ward following the death of the sitting member shortly before the 1991 election.
A by-election was held in the St Dogmaels ward after no nominations were received for the regular election.