Heywood Park is a public park in the suburb of Unley Park in Adelaide, South Australia. It is home to the last remaining Grey Box gum trees on the Adelaide plains, some of which pre-date European settlement. The park takes its name from the place of birth of William Haslam, the property's last private owner; Heywood in Lancashire, England. The City of Unley council purchased the property and it was officially opened to the public on 10 December 1921.