Luiza Pesjak or Lujiza Pesjakova (12 June 1828 – 31 March 1898) was a Slovene writer, poet and translator.

She spent a considerable time invested in reading, going to the theater and opera as well as traveling and being social.

Pesjak was one of Slovenia's early novelists, producing the story Beatin dnevnik (Beata's Diary) in 1887 as well as writing poetry, plays and the opera libretto for Gorenjski slavček.

Though the family spoke German and French, the girls got a local teacher after the introduction of a constitution granting civil and political liberties in the Austrian Empire in 1860 and it was after this that Pesjak learned Slovene and began to write in the language.

In later life her financial stability decreased and Pesjak lived in restricted means almost forgotten.