This article covers the prehistory and history of Ethiopia.

It was not until 1963 that evidence of the presence of ancient hominids was discovered in Ethiopia, many years after similar such discoveries had been made in neighbouring Kenya and Tanzania. The discovery was made by Gerrard Dekker, a Dutch hydrologist, who found Acheulian stone tools that were over a million years old at Kella. Since then many important finds have propelled Ethiopia to the forefront of palaentology. The oldest hominid discovered to date in Ethiopia is the 4.2 million year old Ardipithicus ramidus (Ardi) found by Tim D. White in 1994. The most well known hominid discovery is Lucy, found in the Awash Valley of Ethiopia's Afar region in 1974 by Donald Johanson, and is one of the most complete and best preserved, adult Australopithecine fossils ever uncovered. Lucy's taxonomic name, Australopithecus afarensis, means 'southern ape of Afar', and refers to the Ethiopian region where the discovery was made. Lucy is estimated to have lived 3.2 million years ago. There have been many other notable fossil findings in the country. Near Gona stone tools were uncovered in 1992 that were 2.52 million years old, these are the oldest such tools ever discovered anywhere in the world.

Ethiopia ( /ˌiːθiˈoʊpiə/) (Ge'ez: ኢትዮጵያ ʾĪtyōṗṗyā), officially known as the Federal Democratic Republic of Ethiopia, is a landlocked country located in the Horn of Africa. It is the second-most populous nation in Africa, with over 82 million inhabitants, and the tenth largest by area, occupying 1,100,000 km². Ethiopia is bordered by Eritrea to the north, Djibouti and Somalia to the east, Sudan and South Sudan to the west, and Kenya to the south. With its capital at Addis Ababa, it is also the most populous landlocked nation in the world.

Ethiopia was a monarchy for most of its history, and the Ethiopian dynasty traces its roots to the 2nd century BC. Ethiopia is also one of the oldest sites of human existence known to scientists today, having yielded some of humanity's oldest traces. It may be the region from which Homo sapiens first set out for the Middle East and points beyond. Alongside Rome, Persia, China and India, the Ethiopian Aksum Empire was considered one of the great world powers of the 3rd century. During the Scramble for Africa, Ethiopia was the only African country beside Liberia that retained its sovereignty as a recognized independent country, and was one of only four African members of the League of Nations. After a brief period of Italian occupation, Ethiopia became a charter member of the United Nations. When other African nations received their independence following World War II, many of them adopted the colors of Ethiopia's flag, and Addis Ababa became the location of several international organizations focused on Africa.

The Kingdom of Kush or Kush was an ancient African state centered on the confluences of the Blue Nile, White Nile and River Atbara in what is now the Republic of Sudan.

Established after the Bronze Age collapse and the disintegration of the New Kingdom of Egypt, it was centered at Napata in its early phase. After king Kashta ("the Kushite") invaded Egypt in the 8th century BC, the Kushite kings ruled as Pharaohs of the Twenty-fifth dynasty of Egypt for a century, until they were expelled by Psamtik I in 656 BC.

During Classical Antiquity, the Kushite imperial capital was at Meroe. In early Greek geography, the Meroitic kingdom was known as Ethiopia. The Kushite kingdom with its capital at Meroe persisted until the 4th century AD, when it weakened and disintegrated due to internal rebellion. The Kushite capital was subsequently captured by the Beja Dynasty, who tried to revive the empire. The Kushite capital was eventually captured and destroyed by the kingdom of Axum. After the collapse of the Kushite empire several states emerged in its former territories, among them Nubia.

Haile Selassie I (Ge'ez: ኃይለ፡ ሥላሴ, "Power of the Trinity") (23 July 1892 – 27 August 1975), born Tafari Makonnen, was Ethiopia's regent from 1916 to 1930 and Emperor of Ethiopia from 1930 to 1974. He was the heir to a dynasty that traced its origins to the 13th century, and from there by tradition back to King Solomon and Queen Makeda, Empress of Axum, known in the Abrahamic tradition as the Queen of Sheba. Haile Selassie is a defining figure in both Ethiopian and African history.

At the League of Nations in 1936, the emperor condemned the use of chemical weapons by Italy against his people. His internationalist views led to Ethiopia becoming a charter member of the United Nations, and his political thought and experience in promoting multilateralism and collective security have proved seminal and enduring. His suppression of rebellions among the nobles (mekwannint), as well as what some perceived to be Ethiopia's failure to modernize adequately, earned him criticism among some contemporaries and historians.