This is a list of former and current castles and fortifications in South Africa and contains historical fortifications, military instillations, mock castles and Manor Houses, that may be referred to as "castles".

A fortification or Fort^[1] is easily identifiable as a structure built purely for defensive purposes, however a castle is slightly more subjective. The historical term castle refers to a Fortification that was also a seat of power and governance over the local area, the modern term might refer to a Manor House, a Châteaux or a Mansion and is more a matter of semantics.^[2] The castles will be discussed by province.

^[3]

• Aliwal North Blockhouses (2)
• Broederstroom Blockhouse
• Burgersdorp Blockhouse
• Dewetsville Blockhouse
• Fort Harlech, Krugersdorp
• Hekpoort Blockhouse
• Hopetown Blockhouse
• Kaalfontein/Zuurfontein Blockhouse
• Modder River Blockhouse
• Noupoort Blockhouse
• Orange River Station
• Pampoennek Blockhouse
• Prieska Blockhouse
• Riversford Blockhouse
• The Reservoir Blockhouse
• The Stormberg Junction South Blockhouse
• Timeball Hill Blockhouse
• The Warrenton Railway Bridge Blockhouse
• Warmbaths Blockhouse
• Witkop Blockhouse

• South African Heritage Resources Agency
• South African National Museum of Military History
• Provincial heritage site (South Africa)
• Military history of South Africa
• Fortifications of the Cape Peninsula
• List of castles in Africa
• History of South Africa
• List of castles
• List of forts