Louisa Siefert (1845 – October 1877) was a best-selling 19th century French poet.

The daughter of Henry Siefert, vice-consul to Portugal, and Adele-Adrienne Belz, she was born and grew up in Lyon.

She wrote a literary column for the Journal de Lyon.

Siefert suffered from migraines and severe arthritis during her short life and died of tuberculosis in Pau at the age of 32.

In Un poète oublié, Lucien Scheler described Siefert's life as "une vie illuminé par la beauté du verbe" (a life illuminated by the beauty of the verb).