The First Dynasty of ancient Egypt were the first group of Egyptian kings to rule over a united country. It began when Upper and Lower Egypt were joined as a single country, probably by Narmer. It is the beginning of the Early Dynastic Period of Egypt. At this time Thinis was the centre of power.

Historians argue about the dates of the First Dynasty which was part of the Early Bronze Age. They use a number of different ways to decide on the dates for events in Egypt. It began sometime between 3400 and 3000 BC. In 2013 radiocarbon dating showed that Hor-Aha began ruling between 3218–3035 BC.