The Twenty-third Dynasty of Egypt is usually classified as the third dynasty of the ancient Egyptian Third Intermediate Period. This dynasty consisted of a number of Meshwesh kings, who ruled either as pharaohs or as independent kings of parts of Upper Egypt from 880 BC to 720 BC, and pharaohs from 837 BC to 728 BC.

The Third Intermediate Period of ancient Egypt began with the death of Pharaoh Ramesses XI in 1077 BC, which ended the New Kingdom, and was eventually followed by the Late Period. Various points are offered as the beginning for the latter era, though it is most often regarded as dating from the foundation of the Twenty-Sixth Dynasty by Psamtik I in 664 BC, following the departure of the Nubian Kushite rulers of the Twenty-fifth Dynasty after they were driven out by the Assyrians under King Ashurbanipal. The use of the term "Third Intermediate Period", based on the analogy of the well-known First and Second Intermediate Periods, was popular by 1978, when British Egyptologist Kenneth Kitchen used the term for the title of his book on the period. While Kitchen argued that the period was 'far from being chaotic' and hoped that his work would lead to the abolishment of the term, with his own preference being the 'Post-Imperial epoch', his use of the term as a title seems only to have entrenched the use of the term.