Romanos (or Romanus) II (Greek: Ρωμανός Β΄, Rōmanos II) (938 – 15 March 963) was a Byzantine Emperor. He succeeded his father Constantine VII in 959 at the age of twenty-one, and died suddenly in 963.

Romanos II was a son of Emperor Constantine VII and Helena Lekapene, the daughter of Emperor Romanos I and his wife Theodora. Named after his maternal grandfather, Romanos was married, as a child, to Bertha, the illegitimate daughter of Hugh of Arles, King of Italy, who changed her name to Eudokia after her marriage. On April 6, 945, after the fall of the Lekapenoi, Constantine VII crowned his son Romanos co-emperor.^{[citation needed][clarification needed]} With Hugh out of power in Italy and dead by 947, and Bertha herself dying in 949, Romanos secured the promise from his father that he would be allowed to select his own bride. Romanos' choice fell on an innkeeper's daughter named Anastaso, whom he married in 956 and renamed Theophano.

In November 959 Romanos II succeeded his father on the throne, among rumors that he or his wife had contributed to the death of Constantine VII by poisoning him. Romanos purged his father's courtiers of his enemies and replaced them with his friends and those of his wife. Among the persons removed from court were the Empress Mother, Helena, and her daughters, all of them being sent to a nunnery. Nevertheless, many of Romanos' appointees were able men, including his chief adviser, the eunuch Joseph Bringas.