Theoctistus
Theoctistus or Theoktistos (Greek: Θεόκτιστος) can refer to:
- Saint Theoctistus (died 451), Byzantine monk and hermit in Palestine, companion of Saint Euthymius the Great
- Theoctistus of Alexandria, a sea captain, martyr, saint, and companion of Faustus, Abibus and Dionysius of Alexandria
- Theoctistus of Naples, Duke of Naples in 818–821
- Theoktistos, chief minister and regent of the Byzantine Empire from 842 to 855
- Theoktistos the Stoudite, 14th-century Byzantine ecclesiastical writer
- Teoctist, born Toader Arăpaşu (1915–2007), was the Patriarch of the Romanian Orthodox Church from 1986 to 2007.