Smithfield is a suburb in the northern outskirts of Adelaide, South Australia. It is in the City of Playford.
Gawler Plains Post Office opened on 12 July 1850 and was renamed Smithfield in 1855.
Smithfield has Main North Road as its eastern boundary, with service stations, the historic Smithfield Hotel and several other businesses and private residences. Anderson Walk is the southern boundary of the original village, which was arranged in a grid with Augusta Square in the centre. West of the older residential area is an industrial zone along the railway line, with Smithfield railway station on the south side of Anderson Walk. Munno Para Shopping City is on the south side of Smith Creek. There are more residential areas south and west of the railway station, and an Army Reserve depot west of the shopping centre which is home to the 3rd/9th Light Horse (South Australian Mounted Rifles) and 49 ACU Army Cadets.
Smithfield Speedway
A 1 mile . It appears to have only operated until about 1930.