Count (feminine: countess) is a historical title of nobility in certain European countries, varying in relative status, generally of middling rank in the hierarchy of nobility. Especially in earlier medieval periods the term often implied not only a certain status, but also that the count had specific responsibilities or offices. The etymologically related English term "county" denoted the territories associated with some countships, but not all.

The title of count is typically not used in England or English-speaking countries, with the equivalent title earl used instead. As a feminine form of earl never developed, the female equivalent countess is retained.

The word count came into English from the French comte, itself from Latin comes—in its accusative form comitem. It meant "companion" or "attendant", and as a title it indicated that someone was delegated to represent the ruler.

In the late Roman Empire, the Latin title comes denoted the high rank of various courtiers and provincial officials, either military or administrative. Before Anthemius became emperor in the West in 467, he was a military comes charged with strengthening defenses on the Danube frontier.

In the Western Roman Empire, "count" came to indicate generically a military commander^{[citation needed]} but was not a specific rank. In the Eastern Roman Empire, from about the seventh century, "count" was a specific rank indicating the commander of two centuriae (i.e., 200 men).

The medieval title of comes was originally not hereditary. It was regarded as an administrative official dependent on the king, until the process of allodialisation during the 9th century in which such titles came to be private possessions of noble families. By virtue of their large estates, many counts could pass the title to their heirs—but not always. For instance, in Piast Poland, the position of komes was not hereditary, resembling the early Merovingian institution. The title had disappeared by the era of the Polish–Lithuanian Commonwealth, and the office had been replaced by others. Only after the Partitions of Poland did the title of "count" resurface in the title hrabia, derived from the German Graf.

In the Frankish kingdoms in the early Middle Ages, a count might also be a count palatine, whose authority derived directly over a royal household, a palace in its original sense of the seat of power and administration. This other kind of count had vague antecedents in Late Antiquity too: the father of Cassiodorus held positions of trust with Theodoric, as comes rerum privatarum, in charge of the imperial lands, then as comes sacrarum largitionum ("count of the sacred doles"), concerned with the finances of the realm.

In the United Kingdom, the title of earl is used instead of count. Although the exact reason is debated by historians and linguists, one of the more popular theories proposes that count fell into disuse because of its phonetic similarity to the vulgar slang word cunt.