Thekla (Greek: Θέκλα; c. 831 – c. 870), latinized as Thecla, was a princess of the Amorian dynasty of the Byzantine Empire. The daughter and eldest child of Byzantine emperor Theophilos and empress Theodora, she was proclaimed Augusta in the late 830s. After Theophilos's death in 842 and her mother becoming regent for Thekla's younger brother Michael III, Thekla was associated with the regime as co-empress.