List of Famous people with last name Just

Casimir II the Just was a Lesser Polish Duke of Wiślica from 1166–1173, and of Sandomierz after 1173. He became ruler over the Polish Seniorate Province at Kraków and thereby High Duke of Poland in 1177; a position he held until his death, though interrupted once by his elder brother and predecessor Mieszko III the Old. In 1186 Casimir also inherited the Duchy of Masovia from his nephew Leszek, becoming the progenitor of the Masovian branch of the royal Piast dynasty, and great-grandfather of the later Polish king Władysław I the Elbow-high. The honorific title "the Just" was not contemporary and first appeared in the 16th century.

James the Just, or a variation of James, brother of the Lord, was a brother of Jesus, according to the New Testament. He was an early leader of the Jerusalem Church of the Apostolic Age. He died as a martyr in AD 62 or 69.

Edward Charles Grenfell, 1st Baron St Just, was a British banker and politician.

Johann August Just was a German keyboard player, violinist and composer.

Simeon the Righteous or Simeon the Just was a Jewish High Priest during the time of the Second Temple. He is also referred to in the Mishnah, where he is described as one of the last members of the Great Assembly.