A Hakka house in southern Fujian.

Hakka architecture is a building style in southern China unique to the Hakka people. They are typically designed for defensive purposes and consist of one entrance and no windows at ground level.

The Hakka were originally immigrants from northern China who settled in the southern provinces. From the seventeenth century onwards, population pressures drove them more and more into conflict with their neighbours (called punti in Cantonese). As rivalry for resources turned to armed warfare, the Hakka began building communal living structures designed to be easily defensible. These houses, sometimes called tulou, were often round in shape and internally divided into many compartments for food storage, living quarters, ancestral temple, armoury etc. The largest houses covered over 40,000 metres squared and it is not unusual to find surviving houses of over 10,000 metres squared.

The materials used for Hakka architecture vary between brick and stone. The external wall is typically 1 metre in thickness and the entire building could be up to three or four stories in height. Often turrets were also built to extend the range of defensive power and to cover otherwise indefensible points. Battlements were also constructed on the top floor for muskets. The gate was the most vulnerable point and it was usually reinforced with stone and covered with iron. A number of smaller gates followed, in case the outer one was breached. With the exception of a few excessively large forts, Hakka houses usually only had one entrance. The round shape of the walls, which became popular in later stages, added to the defensive value of the fortifications and reduced the firepower of artillery against it. A Hakka fort could withstand a protracted siege, since it was well stocked with grains and had an internal source of water. They often also had their own sophisticated sewerage systems.

The architectural style of Hakka forts is largely unique in China and around the world. The typical Chinese house contains a courtyard and other than pagodas, does not often contain any structures higher than two stories. The origins of Hakka architecture have been traced to older forms of fortifications in southern China, as seen in Han Dynasty and Three Kingdoms tomb models unearthed in Guangzhou, Guangdong and in Ezhou, Hubei.