I, the Worst of All (Spanish: Yo, la peor de todas) is an Argentine biographical drama film cowritten and directed by María Luisa Bemberg and starring Assumpta Serna, Dominique Sanda and Héctor Alterio.

The film was released in 1990 and is a biopic on the life of the famous poetess and nun Juana Inés de la Cruz.

The Vicereine warns Sor Juana to be careful about how she speaks and what she reads and tells her of an auto-da-fé she witnessed in which hundreds were burned.

The Archbishop then attempts to censor Sor Juana's books based on a poem she has written about the Vicereine which he claims is sinful.

The former Vicereine tasks a friend to bring a copy to Sor Juana who no longer answers letters and lives in seclusion and poverty in the abbey.

As a final act of contrition Sor Juana writes a letter to the head of the church confessing that she lived her life as a pagan and signing it with her blood and the words, "I worst of all".

The review staff found the movie compelling and attention capturing, presenting a fascinating glimpse into one of the greatest female poets of all time.