The White Croats (Croatian: Bijeli Hrvati; Polish: Biali Chorwaci; Slovak: Bieli Chorváti; Ukrainian: Білі хорвати, romanized: Bili khorvaty), also known simply as Croats, were a group of Early Slavic tribes that lived between East Slavic and West Slavic tribes in the historical region of Galicia north of the Carpathian Mountains (in modern Western Ukraine and Southeastern-Southern Poland), and in Northeastern Bohemia.

Debates continue over the origin of the Croats and related topics. Their ethnonym is usually considered to be of Iranian origin, and historians regard them one of the oldest Slavic tribes or tribal alliances that formed prior to the 6th century CE. They were an East Slavic tribe, but bordered both East Slavic groups (Dulebes and their related Buzhans and Volhynians, Tivertsi, and Ulichs) in Western Ukraine; and West Slavic tribes (Lendians and Vistulans) in southeastern Poland, controlling an important trade route from East to Central Europe. Archaeologically the Croats were mostly related to the Korchak and Luka-Raikovetska cultures identified with the Sclaveni (while their connection to the Antes and to the Penkovka culture remains a matter of dispute). Their area is characterized by use of stone defenses, tiled tombs (and kurgan-like tombs), stone ovens, and many large, fortified settlements and cult buildings. They practiced Slavic paganism. Foreign medieval authors documented the Croats in historical sources and legends, and had their own origo gentis.

In the late-6th and early-7th centuries, some of the Croats migrated from their homeland, White or Great Croatia in the Carpathians, to the Roman province of Dalmatia (in present-day Croatia along the Adriatic Sea), becoming ancestors of the modern South Slavic Croats. They probably were among the Slavs who with the Pannonian Avars plundered the Roman provinces, but when settled they revolted against the Avars and soon started accepting Christianity during the time of Porga (fl. c. 7th century), the first known archon of the Duchy of Croatia. Other Croats who stayed in their Carpathian homeland continued to practise paganism and formed a tribal proto-state with the polis-like gords of Plisnesk, Stilsko, Revno, Halych, Terebovlia (among other) in Western Ukraine, which lasted until the very end of the 10th century. They were pressured and influenced by more centralized polities: Great Moravia, the Duchy of Bohemia, the Duchy of Poland, Kievan Rus' and the Principality of Hungary. After their defeat by Kievan Rus', on their territory were organized East Slavic principalities of Peremyshl, Terebovlia, Zvenyhorod and finally the Principality of Halych.

According to some modern sources, the ethnic name of White Croats was possibly preserved in parts of Western Ukraine and Southern Poland until the 19th and early-20th centuries. Historians see the northern White Croats as having become assimilated into the Ukrainian, Polish, and Czech nationalities, and as having been precursors of the Rusyns.

It is generally believed that the Croatian ethnonym – Hrvat, Horvat and Harvat – etymologically is not of Slavic origin, but a borrowing from Iranian languages. According to the most plausible theory by Max Vasmer, it derives from *(fšu-)haurvatā- (cattle guardian), more correctly Proto-Ossetian / Alanian *xurvæt- or *xurvāt-, in the meaning of "one who guards" ("guardian, protector").

It is considered that the ethnonym is first attested in anthroponyms Horoúathos, Horoáthos, and Horóathos on the two Tanais Tablets, found in the Greek colony of Tanais at the shores of Sea of Azov in the late 2nd and early 3rd century AD, at the time when the colony was surrounded by Iranian speaking Sarmatians. However, acceptance of any non-Slavic etymology is problematic because it implies an ethnogenesis relationship with the specific ethnic group. There is no mention of an Iranian tribe named as Horoat in the historical sources, but it was not uncommon for Slavic tribes to get their tribal names from anthroponyms of their forefathers and chiefs of the tribe, like in the case of Czechs, Dulebes, Radimichs, and Vyatichi.

Any mention of the Croats before the 9th century is uncertain, and there were several loose attempts at tracing; Struhates, Auhates, and Krobyzoi by Herodotus, Horites by Orosius in 418 AD, and the Harus (original form Hrws, some read Hrwts; Hros, Hrus) at the Sea of Azov, near the mythical Amazons, mentioned by Zacharias Rhetor in 550 AD. The Hros some relate to the ethnonym of the Rus' people. The distribution of the Croatian ethnonym in the form of toponyms in later centuries is considered to be hardly accidental because it is related with Slavic migrations to Central and South Europe.

The epithet "white" for the Croats and their homeland is usually related to the use of colors for cardinal directions among Eurasian people. That is, it meant "Western Croats", or "Northern Croats", in comparison to Eastern Carpathian lands where they lived before. The epithet "great" (megali) probably was not just an association with size as could signify an "old, ancient" or "former" homeland, for the White Croats and Croats when they were new arrivals in the Roman province of Dalmatia. In semantical comparison, as the color "white" besides the meaning "Western" of something/someone could also mean "younger" (later also associated with "unbaptized"), the association with "great" is contradictory. The ethnonym with the epithet was also questioned lexically and grammatically by linguists like Petar Skok, Stanisław Rospond, Jerzy Nalepa and Heinrich Kunstmann, who argued that the Byzantines did not differentiate Slavic "bělъ-" (white) from "velъ-" (big, great), and because of common Greek betacism, the "Belohrobatoi" should be read as "Velohrobatoi" ("Velohrovatoi"; "Great/Old Croats" not "White Croats"). The possible confusion could have happened if the original Slavic form "velo-" was transcribed to Greek alphabet and then erroneously translated, but such a conclusion is not always accepted.