Stephen IV (c. 1133 – 11 April 1165, Zimony), King of Hungary (1163–1165).

In his youth, he rebels against his brother, King Géza II of Hungary, and has to flee to the Court of the Byzantine Emperor, Manuel I Komnenos.

Following his brother's death, the Hungarian barons, under the menace of the Byzantine Emperor, accepte his younger brother, Ladislaus II, as king against their nephew, King Stephen III.

When Ladislaus II dies shortly afterwards, Stephen is proclaimed king, but the young King Stephen III manages to win over him.

Stephen dies in exile fighting against Hungary on behalf of the Byzantine Empire.