De fide Catolica may refer to:

• The edict "De fide catholica" issued by Emperor Theodosius in 380, establishing Christianity as the official religion of the Roman Empire
• The tractate De fide catholica of Boethius (480–524 or 525)
• De fide catholica ex Veteri et Novo Testamento contra Iudaeos by Isidore of Seville (560–636)
• The Summa contra Gentiles, also known as Tractatus de fide catholica, contra contra errores infidelium, of Thomas Aquinas (1225–1274)
• The constitution "De fide catholica" of the First Vatican Council, also called Dei Filius
• A form of belief in the Catholic faith