Louisa Finch, Countess of Aylesford (née Thynne; 25 March 1760 – 28 December 1832) was an English naturalist and botanical illustrator who made studies and paintings of the plants, algae, and fungi from the Warwickshire area.

She was born the eldest daughter of the politician Thomas Thynne, 1st Marquess of Bath, and his wife, the former Lady Elizabeth Bentinck.

[5] She amassed an extensive collection of minerals, which was acquired by Henry Heuland after her death.

[6] Her plants are collected in Oxford University, and her minerals and manuscripts in the Natural History Museum.

[7] Lady Louisa married Heneage Finch, 4th Earl of Aylesford, on 18 November 1781.