List of largest empires
Several empires in human history have been contenders for the largest of all time, depending on definition and mode of measurement. Possible ways of measuring size include area, population, economy, and power. Of these, area is the most commonly used because it has a relatively precise definition and can be feasibly measured with some degree of accuracy; nevertheless, even area is limited in this regard because of the difficulty in defining the boundaries of empires due to things like the indirect nature of imperial control and sparsely inhabited or even uninhabited areas that may nominally have been controlled by an empire but not meaningfully ruled by it.
Estonian political scientist Rein Taagepera, who published a series of academic articles about the territorial extents of historical empires between 1978 and 1997, and a book in 2024, defined an empire in this context as "any relatively large sovereign political entity whose components are not sovereign" and its size as the area over which the empire has some undisputed military and taxation prerogatives. The list is not exhaustive as there is a lack of available data for several empires; for this reason and because of the inherent uncertainty in the estimates, no rankings are given.
Largest empires by land area
For context, the land area of the Earth, excluding the continent of Antarctica, is.Empires at their greatest extent
Empire size in this list is defined as the dry land area it controlled at the time, which may differ considerably from the area it claimed. For example: in the year 1800, European powers collectively claimed approximately % of the Earth's land surface that they did not effectively control. Where estimates vary, entries are sorted by the lowest estimate. Where more than one entry has the same area, they are listed alphabetically.Timeline of largest empires to date
The earliest empire which can with certainty be stated to have been larger than all previous empires was that of Upper and Lower Egypt, which covered ten times the area of the previous largest civilisation around the year 3000 BC.Timeline of largest empires at the time
Largest empires by share of world population
Because of the trend of increasing world population over time, absolute population figures are for some purposes less relevant for comparison between different empires than their respective shares of the world population at the time. For the majority of the time since roughly 400 BC, the two most populous empires' combined share of the world population has been 30–40%. Most of the time, the most populous empire has been located in China.| Empire | Empire population as percentage of world population | Year |
| Qing dynasty | 37 | |
| Northern Song dynasty | 33 | |
| Western Han dynasty | 32 | |
| Mongol Empire | 31 | |
| Roman Empire | 30 | |
| Jin dynasty | 28 | |
| Ming dynasty | 28 | |
| Qin dynasty | 24 | |
| Mughal Empire | 24 | |
| Tang dynasty | 23 | |
| Delhi Sultanate | 23 | |
| British Empire | 23 | |
| Empire of Japan | 20 | |
| Maurya Empire | 19 | |
| Former Qin | 19 | |
| Northern Zhou | 16 | |
| Macedonian Empire | 15 | |
| Empire of Harsha | 15 | |
| Gupta Empire | 13 | |
| Northern Wei | 13 | |
| Umayyad Caliphate | 13 | |
| Achaemenid Empire | 12 | |
| Former Yan | 12 | |
| Jin dynasty | 12 | |
| Nazi Germany | 12 |