Helena Lekapene (Medieval Greek: Ἑλένη Λεκαπηνή, romanized: Lecapena) (c. 910 – 19 September 961) was the empress consort of Constantine VII, known to have acted as his political adviser and de facto co-regent.

The deaths of Emperor Leo VI the Wise in 912 and his brother and successor Alexander in 913 left the throne of the Byzantine Empire to Constantine VII.

However, Leo led the Byzantine army into a series of lost battles against Simeon I of Bulgaria in one campaign of the Byzantine-Bulgarian Wars.

In 919, a coup d'état involving various factions managed to remove Zoe from power.

Romanos orchestrated the marriage of Helena to Constantine VII as a way to secure a connection to the legitimate Macedonian dynasty.

On 17 December 920, Romanos was crowned co-emperor and in effect became the senior of the two associate emperors.

Before his elevation to the throne, Christopher was married to Sophia, daughter of magistros Niketas.

Constantine VII was restored to his position as senior emperor after 24 years as junior co-ruler.

When Constantine VII died on 9 November 959, Romanos II succeeded him to the throne.

Her death on 19 September 961 is among the last events recorded in the Theophanes Continuatus chronicle.