List of Famous people born in Istria County, Croatia

Archduchess Eleonora of Austria was a daughter of Archduke Charles Stephen of Austria and a first cousin of King Alphonso XIII of Spain. She was member of the Teschen branch of the House of Habsburg-Lorraine and an Archduchess of Austria and Princess of Bohemia, Hungary, and Tuscany by birth. She renounced to her titles upon her morganatic marriage to Alfons Kloss, the captain of her father's yacht. During World War II her sons served in the German army.

Archduchess Renate of Austria was a daughter of Archduke Charles Stephen of Austria and a first cousin of King Alphonso XIII of Spain. A member of the Teschen branch of the House of Habsburg-Lorraine and an Archduchess of Austria and Princess of Bohemia, Hungary, and Tuscany by birth, she renounced her titles in 1909 upon her marriage to Prince Jerome Radziwiłł.

Leo Karl Maria Cyril-Methodius Habsburg-Lorraine, Archduke of Austria was an Austrian military officer, a member of the House of Habsburg-Lorraine. He was the fifth child and the second son of Archduke Charles Stephen of Austria and Archduchess Maria Theresia, Princess of Tuscany.

Archduke Karl Albrecht of Austria-Teschen (Karl Albrecht Nikolaus Leo Gratianus von Österreich, later Karl Albrecht Habsburg-Lothringen, since 1919 – Karol Olbracht Habsburg-Lotaryński; was an Austrian military officer, a member of the House of Habsburg-Lorraine.

Agathe Johanna Erwina Gobertina von Trapp was the eldest daughter of Georg von Trapp and his first wife, Agathe Whitehead von Trapp. She was also a member of the Trapp Family Singers, whose lives were the inspiration for the 1959 musical play and 1965 film The Sound of Music. She was portrayed as the character "Liesl".

Archduchess Mechthildis of Austria was a daughter of Archduke Charles Stephen of Austria and a first cousin of King Alphonso XIII of Spain. She was a member of the Teschen branch of the House of Habsburg-Lorraine and an Archduchess of Austria and Princess of Hungary, and Bohemia by birth. In 1913 she married Prince Olgierd Czartoryski. The couple had four children and lived in Poland until the outbreak of World War II when they emigrated to Brazil.

Luka Stepančić is a Croatian professional handball player for SC Pick Szeged and the Croatian national team.

István Horthy de Nagybánya was Hungarian Regent Admiral Miklós Horthy's eldest son, a politician, and, during World War II, a fighter pilot.

Flavius Julius Crispus was the eldest son of the Roman emperor Constantine the Great and his junior emperor (caesar) from March 317 until his execution by his father in 326. The grandson of the augustus Constantius I, Crispus was the elder half-brother of the future augustus Constantine II and became co-caesar with him and with his cousin Licinius II at Serdica, part of the settlement ending the Cibalensean War between Constantine and his father's rival Licinius I. Crispus ruled from Augusta Treverorum (Trier) in Roman Gaul between 318 and 323 and defeated the navy of Licinius I at the Battle of the Hellespont in 324, which with the land Battle of Chrysopolis won by Constantine forced the resignation of Licinius and his son, leaving Constantine the sole augustus and the Constantinian dynasty in control of the entire empire. It is unclear what was legal status of the relationship Crispus's mother Minervina had with Constantine; Crispus may have been an illegitimate son.

Miklós Horthy de Nagybánya II was the younger son of Hungarian regent Admiral Miklós Horthy and, until the end of World War II, a politician.