John I may refer to:
People
Religious figures John I (bishop of Jerusalem) John Chrysostom (349 – c. 407), Patriarch of Constantinople John I of Antioch (died 441) Pope John I of Alexandria, Coptic Pope from 496 to 505 Pope John I, Pope from 523 to 526 John I (exarch) (died 615), Exarch of Ravenna John I (archbishop of Trier) (c. 1140-1212), Archbishop of Trier from 1190 to 1212 Pope John Paul I, Pope in 1978
Counts
John I of Ponthieu (c. 1147 – 1191) John I of Dreux (1215–1249) John I of Avesnes (1218–1257), Count of Hainaut John I, Count of Blois (died 1280) John I of Brienne, Count of Eu (died 1294) John I, Count of Holland (1284–1299) John I Orsini (1303/4–1317), Count of Cephalonia John I of Nassau-Weilburg (1309–1371) John I, Count of La Marche (1344–1393) John Günther I, Count of Schwarzburg-Sondershausen, (1532–1586) John I, Count Palatine of Zweibrücken (1550–1604)
Dukes
John I of Naples (died c. 719) John I of Amalfi (died 1007) John of Brunswick, Duke of Lüneburg (c. 1242–1277) John I, Duke of Saxony (1249–1285) John I, Duke of Brittany (1217–1286) John I, Duke of Brabant (1253–1294) John I, Duke of Bavaria (1329–1340) John I, Duke of Opava-Ratibor (c. 1322 – c. 1380–1382) John I, Duke of Mecklenburg-Stargard (1326–1392/93) John I, Duke of Lorraine (1346–1390) John, Duke of Berry (1340–1416) John the Fearless (1371-1419), ruler of the Burgundian State from 1404 to 1419 John I of Münsterberg (ca. 1380 – 1428) John I, Duke of Bourbon (1381–1434) John Albert I, Duke of Mecklenburg, (1525–1576) John, 6th Duke of Braganza (1543–1583), a.k.a. John I, Duke of Braganza John Ernest I, Duke of Saxe-Weimar (1594–1626) Johann Adolf I, Duke of Saxe-Weissenfels (1649–1697)
Emperors
John I Tzimiskes (c. 925 – 976), Byzantine Emperor John I of Trebizond (died 1238) Yohannes I of Ethiopia (ruled 1667–1692)
Kings
John of Abkhazia (ruled 878/879–880) John of England (1166–1216), King of England, Lord of Ireland, Duke of Normandy and Aquitaine and Count of Anjou John I of Sweden (c. 1201 – 1222), king of Sweden John of Brienne (c. 1148 – 1237), king of Jerusalem John I of Cyprus (1259–1285) John of Scotland (c. 1249 – c. 1313) John I of France (1316), king for the five days he lived John I of Bohemia (1296–1346) John I of Castile (1358–1390) John I of Aragon (1350–1396) John I of Portugal (1357–1433), King of Portugal and of the Algarve, Lord of Ceuta John I Albert of Poland, (1459–1501) João I of Kongo, ruler of the Kingdom of Kongo between 1470 and 1509 Hans, King of Denmark (1455–1513), King of Denmark, Norway and Sweden János Szapolyai (1487–1540), King of Hungary and Slavonia John of Saxony (1801–1873)
Princes
John I, Prince of Anhalt-Bernburg (d. 1291) Hans-Adam I, Prince of Liechtenstein (1662–1712)
Others John I of Gaeta (died c. 933) John I Doukas of Thessaly (1268–1289) John I of Montferrat (c. 1275–1305), Marquis of Montferrat John of Islay, Lord of the Isles (died 1386) John I of Alençon (1385–1415) John Frederick I, Elector of Saxony (1503–1554)
Biblical John 1, the first chapter of the Gospel of John First Epistle of John or 1 John
See also Jean I (disambiguation) Juan I (disambiguation) Johann I (disambiguation) John (disambiguation) King John (disambiguation)