A count palatine (Latin comes palatinus), also count of the palace or palsgrave (from German Pfalzgraf), was originally an official attached to a royal or imperial palace or household and later a nobleman of a rank above that of an ordinary count. The title originated in the Late Roman Empire. In the Middle Ages especially and into modern times, it is associated with the Holy Roman Empire, especially Electoral Palatinate.

The office, jurisdiction or territory of a count palatine was a county palatine or palatinate. In England the forms earl palatine and palatine earldom are rare alternative terms.

This Latin title is the original, but is also pre-feudal: it originated as Roman comes, which was a non-hereditary court title of high rank meaning "companion" and connoting the status of peer, the specific part palatinus being the adjective derived from palatium ('palace').

After the fall of Rome, a new feudal type of title, also known simply as palatinus, started developing. The Frankish kings of the Merovingian dynasty (reigned 480–750) employed a high official, the comes palatinus, who at first assisted the king in his judicial duties and at a later date discharged many of these himself. Other counts palatine were employed on military and administrative work.

In the Visigothic Kingdom, the Officium Palatinum consisted of a number of men with the title of count who managed the various departments of the royal household. The Comes Cubiculariorum oversaw the chamberlains, the Comes Scanciorum directed the cup-bearers, the Comes Stabulorum directed the equerries in charge of the stables, etc. The Ostrogothic Kingdom also maintained palatine counts with titles such as Comes Patrimonium, who was in charge of the patrimonial or private real estate of the king, and others.

The system was maintained by the Carolingian sovereigns (reigned 751–987), who increased the power of counts palatine through successive grants of authority. A Frankish capitulary of 882 and Hincmar, archbishop of Reims, writing about the same time, attest to the extent to which the judicial work of the Frankish Empire had passed into the hands of counts palatine.

Instead of remaining near the person of the king, some of the counts palatine were sent to various parts of his empire to act as judges and governors, the districts ruled by them being called palatinates. Being in a special sense the representatives of the sovereign, they were entrusted with more extended power than the ordinary counts. In this way came about the later and more general use of the word "palatine", its application as an adjective to persons entrusted with special powers—but also to the districts over which these powers were exercised.

By the High Middle Ages, the title "count" had become increasingly common, to the point that both great magnates who ruled regions that were the size of duchies, and local castle-lords, might style themselves "count." As the great magnates began to centralize their power over their local castle-lords, they felt the need to assert the difference between themselves and these minor "counts". Therefore, several of these great magnates began styling themselves "Count palatine", signifying great counts ruling regions equivalent to duchies, such as the Counts Palatine of Champagne in the 13th century. See also Royal Administration of Merovingian and Carolingian Dynasties.