1991 UK Athletics Championships

The 1991 UK Athletics Championships sponsored by Pearl Assurance, was the national championship in outdoor track and field for the United Kingdom held at Cardiff Athletics Stadium, Cardiff. It was the second time that the event was held in the Welsh capital, following on from the 1990 championships there.

It was the fifteenth edition of the competition limited to British athletes only, launched as an alternative to the AAA Championships, which was open to foreign competitors. However, because the calibre of national competition remained greater at the AAA event, the UK Championships this year were not considered the principal national championship event by some statisticians, such as the National Union of Track Statisticians (NUTS). Many of the athletes below also competed at the 1991 AAA Championships.