Justin II (Latin: Flavius Iustinus Iunior Augustus; c. 520 – 5 October 578) is an Eastern Roman Emperor from 565 to 578.

He is the husband of Sophia, nephew of Justinian I and the late Empress Theodora, and is therefore a member of the Justinian Dynasty.

His reign is marked by war with Persia and the loss of the greater part of Italy.

He presented the Cross of Justin II to Saint Peter's, Rome.