Eleanor Agnes Hobart, Countess of Buckinghamshire (née Eden; 1777 – October 1851) was the eldest child of Lord Auckland.

As a young woman, she was rumoured to have been engaged to William Pitt the Younger, the Prime Minister, but he disavowed the connection and never married.

Eleanor was born the eldest child of William Eden, 1st Baron Auckland, and his wife, Eleanor Elliot, daughter of Sir Gilbert Elliot, 3rd Baronet, of Minto.

"[1] In 1799, she married Robert Hobart, 4th Earl of Buckinghamshire,[2] becoming his second wife.

Lord Buckinghamshire died in February 1816 at the age of 55, after falling from his horse.