- Neanderthals: inhabited the peninsula from 200,000 to 35,000 years ago
- Homo sapiens: arrived in the peninsula around 40,000 years ago and coexisted with Neanderthals for a period of time before eventually replacing them.
Pre-Celtic peoples:
- Iberians: an ancient people who inhabited the eastern and southern parts of the peninsula, from the 7th century BCE onwards
- Celts: an Indo-European people who migrated to the peninsula from central Europe around the 6th century BCE, eventually dominating much of the northern and western regions
- Tartessians: an ancient civilization that flourished in the southwest of the peninsula, centered around the city of Tartessos, from the 9th to the 6th century BCE
Other ancient peoples that inhabited the Iberian Peninsula:
- Greeks: established colonies in the eastern coast of the peninsula, such as Emporion (Empúries), from the 6th century BCE onwards
- Phoenicians: established trading colonies in the southern and eastern coasts, such as Gadir (Cádiz), from the 8th century BCE onwards
- Carthaginians: a Phoenician civilization that expanded its influence to the peninsula from North Africa, controlling much of the eastern and southern coasts from the 6th century BCE to the 2nd century BCE, when they were defeated by the Romans in the Punic Wars