Joachim Westphal (born at Hamburg 1510 or at the beginning of 1511; died there 16 January 1574) was a German "Gnesio-Lutheran" theologian. From 1571 to 1574 he served as Superintendent of Hamburg (per pro already since 1562), presiding as spiritual leader over the Lutheran state church of the city-state.
He was educated in the school of the parish of St. Nicolai in his native city, then in Lüneburg, and entered the University of Wittenberg, where he became the pupil of Melanchthon and Luther. In 1532, on the recommendation of Melanchthon, he was appointed teacher at the Johanneum in his native city. In 1534 he returned to the University of Wittenberg, and in the following year removed with the university to Jena. After his return to Wittenberg in 1537 he lectured on philology. In 1541 he became preacher of the church of St. Catharine in Hamburg; then acting superintendent in 1562, and was elected Superintendent of Hamburg in 1571.
He is best known for his participation in the theological controversies of his time. He took part in that on the descent into hell, also in the discussion concerning the Leipzig Interim and in that over the Adiaphora. More important was that over the Lord's Supper. In 1552 he published Farrago confusanearum et inter se dissidentium opinionum de coena Domini, ex Sacramentariorum libris congesta, a warning against those who deny the presence of Christ in the Lord's Supper. He points out to the adherents of Luther the alarming progress which the sacramentarians had made and tries to prove the falsity of their doctrine by its diversity. In 1553 he issued Recta fides de coena Domini, an exegetical discussion of 1 Cor. 11 and the Words of Institution; in 1555 Collectanea sententiarum D. Aurelii Augustini de coena Domini and Fides Cyrilli episcopi Alexandriae de praesentia corporis et sanguinis Christi.