Elżbieta Sieniawska politically influential Polish magnate (b. 1669)
Elżbieta Helena Sieniawska, née Lubomirska (Końskowola, 1669 – 21 March 1729, Oleszyce), was a Polish noblewoman, Grand Hetmaness of the Crown (Hetmanowa wielka koronna), and a renowned patron of the arts.

An influential woman politician in the Polish–Lithuanian Commonwealth during the reign of Augustus II the Strong, she was deeply embroiled in the Great Northern War and in Rákóczi's War for [Hungarian] Independence.

She was considered the most powerful woman in the Commonwealth and was called "the uncrowned Queen of Poland".