kˈæstʃəlˌoʊ lˈætɪn: kˈæstʃəlˌoʊ; aɪbˈɪɹiən: kæstˈɪloʊ wʌz ɐn aɪbˈɪɹiən tˈaʊn ænd bˈɪʃəpɹˌɪk nˈaʊ lˈætɪn tˈɪtʃəlɚ sˈiː loʊkˈeɪɾᵻd ɪnðɪ ˌændɐlˈuːʒən pɹˈɑːvɪns ʌv dʒæˈeɪn, ɪn sˈaʊθsˈɛntɹəl spˈeɪn, nˌɪɹ mˈɑːdɚn lˈɪnɛɹz.
Castulo (Latin: Castulo; Iberian: Kastilo) was an Iberian town and bishopric (now Latin titular see located in the Andalusian province of Jaén, in south-central Spain, near modern Linares.