Philistines (Hebrew: פְּלִשְׁתִּים, romanized: Pəlištīm; LXX Koine Greek: Φυλιστιείμ, romanized: Phulistieím; Latin: Philistaei) were ancient people who lived on the south coast of Canaan during the Iron Age in a confederation of city-states generally referred to as Philistia.

There is evidence to suggest that the Philistines originated from a Greek immigrant group from the Aegean. The immigrant group settled in Canaan around 1175 BC, during the Late Bronze Age collapse. Over time, they intermixed with the indigenous Canaanite societies and assimilated elements from them, while preserving their own unique culture.

In 604 BC, the Philistines, who had been under the rule of the Neo-Assyrian Empire (911–605 BC), were ultimately vanquished by King Nebuchadnezzar II of the Neo-Babylonian Empire. Much like the kingdoms of Israel and Judah, the Philistines lost their autonomy by the end of the Iron Age, becoming vassals to the Assyrians, Egyptians, and later Babylonians. Historical sources suggest that Nebuchadnezzar II destroyed Ashkelon and Ekron due to the Philistines' rebellion, leading to the exile of many Philistines, who gradually lost their distinct identity in Babylonia. By the late fifth century BC, the Philistines no longer appear as a distinct group in historical or archaeological records, though the extent of their assimilation remains subject to debate.

The Philistines are known for their biblical conflict with the peoples of the region, in particular, the Israelites. Though the primary source of information about the Philistines is the Hebrew Bible, they are first attested to in reliefs at the Temple of Ramesses III at Medinet Habu, in which they are called the Peleset (𓊪𓏲𓂋𓏤𓏤𓐠𓍘𓇋𓍑), accepted as cognate with Hebrew Peleshet; the parallel Assyrian term is Palastu, Pilišti, or Pilistu (Akkadian: 𒉺𒆷𒀸𒌓, 𒉿𒇷𒅖𒋾, and 𒉿𒇷𒅖𒌓). They also left behind a distinctive material culture.

The English term Philistine comes from Old French Philistin; from Classical Latin Philistinus; from Late Greek Philistinoi; from Koine Greek Φυλιστιείμ (Philistiim), ultimately from Hebrew Pəlištī (פְּלִשְׁתִּי; plural Pəlištīm, פְּלִשְׁתִּים), meaning 'people of Pəlešeṯ' (פְּלֶשֶׁת). The name also had cognates in Akkadian Palastu and Egyptian Palusata. The native Philistine endonym is unknown.

During the Late Bronze Age collapse, an apparent confederation of seafarers known as the Sea Peoples are recorded as attacking ancient Egypt and other Eastern Mediterranean civilizations. While their exact origins are a mystery, and probably diverse, it is generally agreed that the Sea Peoples had origins in the greater Southern European and West Asian area, including western Asia Minor, the Aegean, and the islands of the East Mediterranean. Egypt, in particular, repelled numerous attempted invasions from the Sea Peoples, most famously at the Battle of the Delta (c. 1175 BC), where pharaoh Ramesses III defeated a massive invasion force which had already plundered Hattusa, Carchemish, Cyprus, and the Southern Levant. Egyptian sources name one of these implicated Sea Peoples as the pwrꜣsꜣtj, generally transliterated as either Peleset or Pulasti. Following the Sea Peoples' defeat, Ramesses III allegedly relocated a number of the pwrꜣsꜣtj to southern Canaan, as recorded in an inscription from his funerary temple in Medinet Habu, and the Great Harris Papyrus. Though archaeological investigation has been unable to correlate any such settlement existing during this time period, this, coupled with the name Peleset/Pulasti and the peoples' supposed Aegean origins, has led many scholars to identify the pwrꜣsꜣtj with the Philistines.

Typically "Philistine" artifacts begin appearing in Canaan by the 12th century BC. Pottery of Philistine origin has been found far outside of what would later become the core of Philistia, including at the majority of Iron Age I sites in the Jezreel Valley; however, because the quantity of said pottery finds are light, it is assumed that the Philistines' presence in these areas were not as strong as in their core territory, and that they probably were a minority which had assimilated into the native Canaanite population by the 10th century BC.

There is little evidence that the Sea Peoples forcefully injected themselves into the southern Levant; and the cities which would become the core of Philistine territory, such as Ashdod, Ashkelon, Gath, and Ekron, show nearly no signs of an intervening event marked by destruction. The same can be said for Aphek where an Egyptian garrison was destroyed, likely in an act of warfare at the end of the 13th century, which was followed by a local Canaanite phase, which was then followed by the peaceful introduction of Philistine pottery. The lack of destruction by the Sea Peoples in the southern Levant should not be surprising as Canaan was never mentioned in any text describing the Sea Peoples as a target of destruction or attack by the Sea Peoples. Other sites such as Tell Keisan, Acco, Tell Abu Hawam, Tel Dor, Tel Mevorak, Tel Zeror, Tel Michal, Tel Gerisa, and Tel Batash, have no evidence of a destruction ca. 1200 BC.