Marianna "Anna" Leszczyńska (25 May 1699 – 20 June 1717) was the eldest child of Stanisław Leszczyński and Catherine Opalińska.

Marianna Leszczyńska was born on 25 May 1699 in Poland, as the eldest child of Stanisław Leszczyński and Catherine Opalińska.

Her only sister, Maria Leszczyńska, was born four years later in 1703 and was later crowned Queen of France as the consort of Louis XV.

Although her father called many doctors to her bedside, they likely accelerated her death by applying multiple purges and bleeding.

[2] Her death devastated the Leszczyński family, especially her father, whom asked his second daughter Maria to never pronounce the name of Anna before him again.