Ancient Greek clubs (Greek: ἑταιρείαι, hetaireiai) were associations of ancient Greeks who were united by a common interest or goal.
The earliest reference of clubs in ancient Greece appears in the law of Solon, which is quoted in the Digest of Justinian I (47.22). This law guaranteed the administrative independence of such associations if they kept within the bounds of the law.
The Digest mentions these associations for religious practices, burial, trade, privateering, and communal meals. It also mentions demes, citizen groups based on subdivisions of land, and phratries, kinship groups. Other than this law, information about the clubs have been found primarily on inscriptions, including those related to burial practices and common meals.
During the time span of 448 and 431 BC, that is between the end of Persian Wars and the start of the Peloponnesian War, there were political clubs called hetairiai, within both the oligarchic and democratic parties. Supposed members included: , a leader in the Athenian democracy, (Plut. Anistides, 2); Pericles, a statesman, orator, and general of Athens, (Plut. Per. 7 and 13); Cimon, an Athenian statesman and general, who had a hundred club member, hetairoi, following him (Plut. Cim. 17). The purpose of these associations was to secure favourable results at elections and in the courts (Thuc. viii. 54). At this time their actions were not regarded as harmful or illegal by ancient Greek society.