Nefertiti (/ˌnɛfərˈtiːti/; c. 1370 – c. 1330 BC) was a queen of the 18th Dynasty of Ancient Egypt, the great royal wife of Pharaoh Akhenaten. Nefertiti and her husband were known for their radical overhaul of state religious policy, in which they promoted an exclusivist and possibly even monotheistic religion, Atenism, centered on the sun disc and its direct connection to the royal household. With her husband, she reigned at what was arguably the wealthiest period of ancient Egyptian history.

After her husband's death, some scholars believe that Nefertiti ruled briefly as the female pharaoh known by the throne name Neferneferuaten just before the ascension of Tutankhamun, although this identification is a matter of ongoing debate. If Nefertiti did rule as pharaoh, her reign was marked by the fall of Amarna and the relocation of the capital back to the traditional city of Memphis after her death.

In the 20th century, Nefertiti was made famous by the discovery and display of her ancient bust, now in Berlin's Neues Museum. The bust is one of the most copied works of the art of ancient Egypt. It is attributed to the Egyptian sculptor Thutmose, and was excavated from his buried studio complex in the early 20th century.

Nefertiti had many titles, including:

While modern Egyptological pronunciation renders her name as Nefertiti, her name was the sentence nfr.t jj.tj (or Nfr.t-jy.tj), meaning "the beautiful one has come", and probably contemporarily pronounced Naftita from older Nafrat-ita or perhaps Nafert-yiti.

Almost nothing is known about Nefertiti's life before her marriage to Akhenaten. Scenes from the tombs of the nobles in Amarna mention that Nefertiti had a sister, named Mutbenret. Further, a woman named Tey carried the title of "Nurse of the Great Royal Wife." In addition, Tey's husband Ay carried the title "God's Father." Some Egyptologists believe that this title was used for a man whose daughter married the pharaoh. Based on these titles, it has been proposed that Ay was in fact Nefertiti's father. However, neither Ay nor Tey are explicitly referred to as Nefertiti's parents in the existing sources. At the same time, no sources exist that directly contradict Ay's fatherhood which is considered likely due to the great influence he wielded during Nefertiti's life and after her death. According to another theory, Nefertiti was the daughter of Ay and a woman besides Tey, but Ay's first wife died before Nefertiti's rise to the position of queen, whereupon Ay married Tey, making her Nefertiti's stepmother. Nevertheless, this entire proposal is based on speculation and conjecture.

It has also been proposed that Nefertiti was Akhenaten's full sister, though this is contradicted by her titles which do not include the title of "King's Daughter" or "King's Sister," usually used to indicate a relative of a pharaoh. Another theory about her parentage that gained some support identified Nefertiti with the Mitanni princess Tadukhipa, partially based on Nefertiti's name ("The Beautiful Woman has Come") which has been interpreted by some scholars as signifying a foreign origin. However, Tadukhipa was already married to Akhenaten's father and there is no evidence for any reason why this woman would need to alter her name in a proposed marriage to Akhenaten, nor any hard evidence of a foreign non-Egyptian background for Nefertiti.

The exact dates when Nefertiti married Akhenaten and became the king's great royal wife are uncertain. They are known to have had at least six daughters together, including Meritaten, Meketaten, Ankhesenpaaten (later called Ankhesenamun when she married Tutankhamun), Neferneferuaten Tasherit, Neferneferure, and Setepenre. She was once considered as a candidate for the mother of Tutankhamun, however a genetic study conducted on discovered mummies suggests that she was not.