Reynella is a metropolitan suburb of Adelaide, South Australia. It is located 20 km south of the Central Business District of Adelaide in the north of the City of Onkaparinga. It is bordered to the east by Main South Road, to the south by Sherriffs Road, and to the north by Field River. Reynella was divided into three smaller suburbs: Reynella, Old Reynella (the historical centre of the district) and Reynella East. Reynella is in the South Australian districts of Mawson and Mitchell.