Daniel I may refer to:
Daniel I of Armenia (ruled 347) Archbishop Danilo I of the Serbian Orthodox Church (ruled 1271–1272) Daniel of Moscow (1261–1303) Daniel I of Kongo (ruled 1674–78) Metropolitan Danilo I Petrović-Njegoš (1670–1735) Danilo I, Prince of Montenegro (1826–1860) Danilo, Crown Prince of Montenegro (1871–1939) Patriarch Daniel of Romania (b. 1951)