The Amphidromia (Greek: τὰ Ἀμφιδρόμια), in ancient Greece, was a ceremonial feast celebrated on the fifth or seventh day after the birth of a child.

It was a family festival of the Athenians, at which the newly born child was introduced into the family, and children of poorer families received its name. Children of wealthier families held a naming ceremony on the tenth day called dekate. This ceremony, unlike the Amphidromia, was open to the public by invitation. No particular day was fixed for this solemnity; but it did not take place very soon after the birth of the child, for it was believed that most children died before the seventh day, and the solemnity was therefore generally deferred till after that period, that there might be at least some probability of the child remaining alive.

According to Suidas, the festival was held on the fifth day, when the women who had lent their assistance at the birth washed their hands, but this purification preceded the real solemnity. The friends and relations of the parents were invited to the festival of the amphidromia, which was held in the evening, and they generally appeared with presents, among which are mentioned the cuttlefish and the marine polyp. The house was decorated on the outside with olive branches if the child was a boy, or with garlands of wool if the child was a girl; and a repast was prepared, at which, if we may judge from a fragment of Ephippus in Athenaeus (ix. p. 370 ; comp. ii. p. 65), the guests must have been rather merry.