As with most academic disciplines, there are a number of archaeological sub-disciplines typically characterised by a focus on a specific method or type of material, geographical or chronological focus, or other thematic concern. In addition, certain civilisations have attracted so much attention that their study has been specifically named. These sub-disciplines include Assyriology (Mesopotamia), Classical archaeology (Greece and Rome), and Egyptology (Egypt).

The other main division of archaeology is into historical archaeology, which examines civilisations that left behind written records and prehistoric archaeology, which concerns itself with societies that did not have writing systems. However, the term is generally valid only in Europe and Asia where literate societies emerged without colonial influence. In areas where literacy arrived relatively late, it is more convenient to use other terms to divide up the archaeological record. In areas of semi-literacy the term protohistoric archaeology can be adopted to cover the study of societies with very limited written records. One example of a protohistoric site is Fort Ross on the northern California coast, which included settlements of literate Russians and non-literate American Indians and Alaska natives.

Ethnoarchaeology is the study of modern societies resembling extinct ones of archaeological interest, for archaeological purposes. It is often difficult to infer solid conclusions about the structure and values of ancient societies from their material remains, not only because objects are mute and say little about those who crafted and used them, but also because not all objects survive to be uncovered by scholars of a later age. Ethnoarchaeology seeks to determine, for instance, what kinds of objects used in a living settlement are deposited in middens or other places where they may be preserved, and how likely an object is to be discarded near to the place where it was used.

Taphonomy is the study of how objects decay and degrade over time. This information is critical to the interpretation of artefacts and other objects, so that the work of ancient people can be differentiated from the later work of living creatures and elemental forces.

A selective list of sub-disciplines distinguished by time period or region of study is given below.

• African archaeology
• Archaeology of the Americas
• Australian archaeology
• European archaeology
• Industrial archaeology focuses on the preservation of material relics of the Industrial Revolution.
• Near Eastern archaeology (sometimes known as Middle Eastern archaeology). See also Biblical archaeology, which applies the results of Near Eastern archaeology to the study of the Bible.
• Medieval archaeology is the study of post-Roman European archaeology until the sixteenth century.
• Post-medieval archaeology is the study of material culture in Europe from the 16th century onwards.
• Modern archaeology is the study of modern society using archaeological methods, e.g. the Tucson Garbage Project.

The following is a list of other sub-disciplines. Some of these are not areas of study in their own right, and are only methods to be used in larger projects.

• Aerial archaeology studying sites from air photos, especially by identifying cropmarks
• Archaeoastronomy is the study of the relationship between the configuration of ancient monuments and astronomy.
• Archaeological science or Archaeometry is the application of scientific techniques or methodologies to archaeology such as radiocarbon dating, statistics and remote sensing.
• Archaeozoology is the study of animal remains in human settlements.
• Archaeobotany or paleoethnobotany is the study of human-plant interaction in the archaeological record.
• Computational archaeology is the application of computers, particularly GIS, to archaeology
• Experimental archaeology involves attempting to re-enact past processes to test theories about ancient manufacturing, engineering and the effects of time on sites and objects (for example flint-knapping)
• Environmental archaeology
• Forensic archaeology is the application of archaeological techniques to criminal investigations. It has become particularly prominent in the investigation of mass-killings associated with war crimes.
• Landscape archaeology involves identifying and studying sites as components in a wider geographical area.
• Maritime archaeology is the study of submerged archaeological sites, including shipwrecks as well as settlements that have been engulfed by bodies of water.
• Museum studies is the display and interpretation of past remains for the public

There are also a wide variety of techniques used for post-excavation analysis.