A mudbrick or mud-brick is an air-dried brick, made of a mixture of loam, mud, sand and water mixed with a binding material such as rice husks or straw. Though mudbricks are known from 7000 to 6000 BCE, since 4000 BC, bricks have also been fired, to increase their strength and durability.
In warm regions with very little timber available to fuel a kiln, bricks were generally sun-dried. In some cases, brickmakers extended the life of mud bricks by putting fired bricks on top or covering them with stucco.
The South Asian inhabitants of Mehrgarh constructed and lived in mud-brick houses between 7000–3300 BC. Mud bricks were used at more than 15 reported sites attributed to the 3rd millennium BC in the ancient Indus Valley Civilization. In the Mature Harappan phase fired bricks were used.
Mudbricks were adopted in the Middle East from Indus Valley Cities during the Pre-Pottery Neolithic B period. The Mesopotamians used sun-dried bricks in their city construction;  typically these bricks were flat on the bottom and curved on the top, called plano-convex mud bricks. Some were formed in a square mould and rounded so that the middle was thicker than the ends.
In Ancient Egypt, workers gathered mud from the Nile river and poured it into a pit. Workers then tramped on the mud while straw was added to solidify the mold. The mudbricks were chemically suitable as fertilizer, leading to the destruction of many ancient Egyptian ruins, such as at Edfu. A well-preserved site is Amarna. Mudbrick use increased at the time of Roman influence.
In areas of Spanish influence, mud-brick construction is called adobe, and developed over time into a complete system of wall protection, flat roofing and finishes which in modern English usage is often referred to as adobe style, regardless of the construction method.
The Great Mosque of Djenné, in central Mali, is the world's largest mudbrick structure. It, like much Sahelian architecture, is built with a mudbrick called Banco, a recipe of mud and grain husks, fermented, and either formed into bricks or applied on surfaces as a plaster like paste in broad strokes. This plaster must be reapplied annually.
Mudbrick architecture worldwide
- Cob – Building material made from subsoil, water, and fibrous organic material
- Earth structure – A building or other structure made largely from soil.
- Loam – Soil composed of similar proportions of sand and silt, and somewhat less clay
- Rammed earth
- Sod house
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- Possehl, Gregory L. (1996)
- Bricks and urbanism in the Indus Valley rise and decline, bricks in antiquity
- Mogens Herman Hansen, A Comparative Study of Six City-state Cultures, Københavns universitet Polis centret (2002) Videnskabernes Selskab, 144 pages ISBN 87-7876-316-9
- C. Michael Hogan, Knossos fieldnotes, Modern Antiquarian (2007)
- Hawkes, Jacquetta (1974). Atlas of Ancient Archaeology. McGraw-Hill Book Company. p. 146. ISBN 0-07-027293-X.
- Kathryn A. Bard and Steven Blake Shubert, Encyclopedia of the Archaeology of Ancient Egypt, 1999, Routledge, 938 pages ISBN 0-415-18589-0
- SACKO, Oussouby (15 November 2015). "Issues of Cultural Conservation and Tourism Development in the Process of World Heritage Preservation" (PDF). Area Studies. Retrieved 7 October 2016.
- Bradbury, Dominic (30 October 2008). "Timbuktu: Mud, mud, glorious mud". The Telegraph. Retrieved 25 February 2012.
- Possehl, Gregory L. (1996). Mehrgarh in Oxford Companion to Archaeology, edited by Brian Fagan. Oxford University Press.
- Earth Architecture, website whose focus is contemporary issues in earth architecture.
- EARTHA: Earth Architecture and Conservation in East Anglia, British organisation that focuses on the proper maintenance and conservation of earth buildings in a region of the UK that has a long history of building with mud. Very experienced experts are contactable and there are regular demonstrations in the area.
- Video showing mud brick making, mud brick building and biolytic sewerage in South Africa.
- CRAterre: Centre de recherche architectural en terre, French university research organisation dedicated to unfired earth construction