The awards recognise the positive impact that lottery-funded projects big and small make to local communities. The Bute scheme is one of 10 projects vying for the best heritage project category.
Work supported by the local friends group has preserved the park's heritage and created educational and recreational opportunities including a new cafe, said Bute Park head of restoration Dr Julia Sas.
The final will be broadcast on BBC1 later this year, with category winners receiving £2,000 for their project. Voting for the semi-final ends on 22 July. See www.lottery goodcauses.org.uk/awards.