Eleonore Charlotte of Württemberg-Montbéliard (20 November 1656 – April 1743) was by marriage Duchess of Oels-Württemberg.
On 7 May 1672, she married Duke Silvius II Frederick of Württemberg-Oels in Oleśnica.
In 1676, Charlotte Eleanor acquired the Lordship and town of Twardogóra and moved her residence there.
She obtained a tax exemption for the town's residents for 100 years from Emperor Leopold I.
In 1712, she had a legal dispute with Anna Sophia of Mecklenburg-Schwerin (1647-1726), the widowed Duchess of Württemberg-Juliusburg.