Lycia (/ˈlɪsiə/; Lycian: 𐊗𐊕𐊐𐊎𐊆𐊖 Trm̃mis; Greek: Λυκία, Lykia; Turkish: Likya) was a historical region in Anatolia from 15–14th centuries BC (as Lukka) to 546 BC. It bordered the Mediterranean Sea in what is today the provinces of Antalya and Muğla in Turkey as well some inland parts of Burdur Province. The region was known to history from the Late Bronze Age records of ancient Egypt and the Hittite Empire.

Lycia was populated by speakers of Luwic languages. Written records began to be inscribed in stone in the Lycian language after Lycia's involuntary incorporation into the Achaemenid Empire in the Iron Age. At that time (546 BC) the Luwian speakers were displaced as Lycia received an influx of Persian speakers.

The many cities in Lycia were wealthy as shown by their elaborate architecture starting at least from the 5th century BC and extending to the Roman period.

Lycia fought for the Persians in the Persian Wars, but on the defeat of the Achaemenid Empire by the Greeks, it became intermittently a free agent. After a brief membership in the Athenian Empire, it seceded and became independent (its treaty with Athens had omitted the usual non-secession clause), was under the Persians again, revolted again, was conquered by Mausolus of Caria, returned to the Persians, and finally fell under Macedonian hegemony upon the defeat of the Persians by Alexander the Great. Due to the influx of Greek speakers and the sparsity of the remaining Lycian speakers, Lycia was rapidly Hellenized under the Macedonians, and the Lycian language disappeared from inscriptions and coinage.

On defeating Antiochus III the Great in 188 BC, the Roman Republic gave Lycia to Rhodes for 20 years, taking it back in 168 BC. In these latter stages of the Roman Republic, Lycia came to enjoy freedom as a Roman protectorate. The Romans validated home rule officially under the Lycian League in 168 BC. This native government was an early federation with republican principles; these later came to the attention of the framers of the United States Constitution, particularly James Madison, influencing their thoughts.

Despite home rule, Lycia was not a sovereign state and had not been since its defeat by the Carians. In 43 AD the Roman emperor Claudius dissolved the league, and Lycia was incorporated into the Roman province of Lycia et Pamphylia. In 395, the province was assigned to the Eastern Roman Empire. It lost the region to the Sultanate of Rum in the early 13th century, which itself collapsed in 1308. It was then absorbed by the Beylik of Teke and came under the rule of the Ottoman Empire in 1423. Lycia was inherited by the Turkish Republic after the Dissolution of the Ottoman Empire.

The borders of Lycia varied over time, but at its centre was the Teke peninsula of southwestern Turkey, which juts southward into the Mediterranean Sea, bounded on the west by the Gulf of Fethiye, and on the east by the Gulf of Antalya. Lycia comprised what is now the westernmost portion of Antalya Province, the easternmost portion of Muğla Province, and the southernmost portion of Burdur Province. In ancient times the surrounding districts were, from west to east, Caria, Pisidia, and Pamphylia, all equally as ancient, and each speaking its own Anatolian language.

The name of the Teke Peninsula comes from the former name of Antalya Province, which was Teke Province, named from the Turkish tribe that settled in the region.