Brenan Park is a 20-hectare (49-acre) urban park situated in the western suburbs of Sydney, New South Wales, Australia. Primarily categorised as a sports field, the reserve contains an open grassland, bushland and recreational areas within the vicinity of native plants, such as eucalyptus trees. It is named after John Ryan Brenan, who founded the suburb of Smithfield in 1836. Artificially terraced, Brenan Park was established in the early 1980s and it is one of the largest reserves in the City of Fairfield, and one of the largest non-golf course green spaces in the Western Sydney region.