Thekla Levinia Andrietta Knös (17 July 1815, Uppsala – 10 March 1880, Växjö), was a Swedish writer, poet and translator.

She and her mother were both important members of the high society life in Uppsala, where they were described as "light beauties, genies of jokes, joy and poetry".

[1] Her mother hosted a literary salon, and Knös was raised in a cultivated but extremely sheltered environment in a home "where they, surrounded by flowers and paintings, lived a life which was allowed to mix with reality only when necessary".

[1] Thekla Knös was described as serious and cultivated, but sheltered and ignorant of all practical necessities of life, nervous and depressive, witty and entertaining but oversensitive and mentally fragile.

In Fotografier af det forna upsalalifvet, the characters depicted were in fact descriptions of her acquaintances such as Per Daniel Amadeus Atterbom, Erik Gustaf Geijer and Hans Järta.