Leo II (Ancient Greek: Λέων, Leōn; c. 467 – 474), called the Younger, briefly reigned as a child emperor of the Eastern Roman Empire from 473 to 474.

His father Zeno was made co-emperor by the Byzantine Senate on 29 January, and they co-ruled for a short time before Leo II died in late 474.

[7] Leo I, who was becoming increasingly ill, felt obligated to declare a successor to the imperial throne, but passed over his son-in-law on account of his unpopularity.

[5][6][11][18] The historian Warren Treadgold wrote that during the reign of Leo II, his father Zeno was the true power behind the throne.

[19][23] The 6th-century writer John Malalas states that he reigned "1 year and 23 days", which, reckoning from his coronation as augustus, would give a death date of 8/9 December.

However, no contemporary sources raised this suggestion even though Zeno was unpopular; thus it is considered likely that Leo II's death was natural, especially taking into account the high child mortality rate of the time.

[27] Zeno's sole rule was opposed by general Basiliscus, brother of Verina, the widow of Leo I, who proclaimed him as emperor in January 475.