thumb|Bolton Castle i England
En kvadratisk borg er en type borg, der er karakteriseret ved bygningsrækker, som er integreret med ringmuren, og som omslutter en central borggård eller kvadrant, typisk med hjørnetårne. Der er ikke noget keep og ofte heller ikke noget særskilt porttårn. Den kvadratiske form stammer primært fra midten til slutningen af 1300-tallet og markerer overgangen fra defensivt orienterede til mere boligprægede stormandshuse. De fire vægge kaldes også fløje.
Kvadratiske borge viser typisk en sofistikeret og kompleks tilgang til planlægningen af de indre sociale rum. Der findes mange kvadratiske borge i Storbritannien, for eksempel: Bodiam Castle i East Sussex og Bolton Castle i Yorkshire.
De 27 kvadratiske borge, som John Rickard har identificeret som værende opført i England, udgør cirka 10 % af de borge , der blev bygget i landet mellem 1272 og 1422. Der blev ikke bygget nogen borge af denne type i Wales.
Et af de tidligste kvadrangulære borge i Tyskland er Neuleiningen, hvor betydelige ruiner stadig eksisterer.
Kvadratiske borge i Storbritannien NavnPlaceringKoordinaterOpførtOpført tilDesignet afHeritage statusBillede Beverston Castle Cotswold 1225 Maurice de GauntThomas de Berkeley, 3. Baron Berkeley Ukendt/anonym Grade I listed buildingscheduled monument Bodiam Castle East Sussex 1385 Edward Dalyngrigge Ukendt/anonym Grade I listed buildingscheduled monument Bolton Castle North Yorkshire 1379 Richard le Scrope, 1. Baron Scrope of Bolton John Lewyn Grade I listed buildingscheduled monument Caverswall Castle Staffordshire Moorlands 1275 William de Caverswall Ukendt/anonym Grade I listed building Cawood Castle North Yorkshire 1378 John Kemp Ukendt/anonym Grade I listed buildingscheduled monument Chideock Castle Dorset 1370s Sir John Chideock Ukendt/anonym scheduled monument Chillingham Castle Northumberland 1344 Sir Thomas Heton Ukendt/anonym Grade I listed building Cooling Castle Medway 1380s John de Cobham, 3. Baron Cobham Henry Yevele Grade I listed buildingscheduled monument Danby Castle North Yorkshire 1302 William Latimer, 1. Lord Latimer Ukendt/anonym Grade I listed buildingscheduled monument Farleigh Hungerford Castle Somerset 1383 Thomas Hungerford Ukendt/anonym Grade I listed buildingscheduled monument Ford Castle Northumberland 1338 Sir William Heron Ukendt/anonym Grade I listed building Fyvie Castle Aberdeenshire 1300'erne Ukendt/anonym Ukendt/anonym category A listed building Greys Court South Oxfordshire 1348 John de Grey, 1. Baron Grey de RotherfieldFrancis Knollys, 1. Viscount KnollysBaron Lovel Ukendt/anonym Grade I listed buildingscheduled monument Greystoke Castle Westmorland and Furness 1353 William de Greystoke, 2. Baron Greystoke Ukendt/anonym Grade II* listed building Hartley Castle Westmorland and Furness 1353 Thomas de MusgraveSir Richard Musgrave, 1. Baronet Ukendt/anonym scheduled monumentGrade II listed building Hemyock Castle Mid Devon 1380 Margaret and William Asthorpe Ukendt/anonym scheduled monumentGrade II* listed building Hever Castle Hever 1271 William de Hever Ukendt/anonym Grade I listed building Inverlochy Castle Highland 1270s Clan Cumming Ukendt/anonym category B listed building Lumley Castle County Durham 1389 Ralph de Lumley, 1. Baron Lumley John LewynJohn Vanbrugh Grade I listed building Maxstoke Castle Warwickshire 1345 William de Clinton, 1. jarl af Huntingdon Ukendt/anonym Grade I listed buildingscheduled monument Moor End Castle Northamptonshire 1347 Edvard 3. af EnglandThomas de Ferrers Ukendt/anonym scheduled monument Raby Castle County Durham 1378 House of Neville John Lewyn Grade I listed building Ravensworth Castle Tyne and Wear 1350s Marmaduke Lumley Ukendt/anonym Grade II* listed buildingscheduled monument Sheriff Hutton Castle North Yorkshire 1382 John Neville, 3. Baron Neville de Raby John Lewyn Grade II* listed buildingscheduled monument Shirburn Castle South Oxfordshire 1377 Warin de Lisle Henry Yevele Grade I listed building Somerton Castle North Kesteven 1281 Antony Bek Ukendt/anonym Grade I listed buildingscheduled monument Starborough Castle Surrey 1341 Reginald de Cobham, 1. Baron Cobham Ukendt/anonym scheduled monumentGrade II* listed building Sudeley CastleGloucestershire 1443Ralph Boteler, 1. Baron Sudeley Ukendt/anonymGrade I listed building Westenhanger Castle KentShepway 1343 John de CriolEdward Poynings Ukendt/anonym scheduled monumentGrade I listed building Wingfield Castle Mid Suffolk 1384 Michael de la Pole, 1. jarl af Suffolk Ukendt/anonym Grade I listed building Woodcroft Castle Cambridgeshire 1280 Ukendt/anonym Ukendt/anonym Grade II* listed building Woodsford Castle Dorset 1336 William de WhitefieldGuy de Bryan, 1. Baron Bryan Ukendt/anonym Grade I listed building Wressle Castle East Riding of Yorkshire 1390'erne Thomas Percy, 1. jarl af WorcesterHenry Percy, 5. jarl af Northumberland John Lewyn Grade I listed buildingscheduled monument
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