June 3 is the 154th day of the year (155th in leap years). There are 211 days remaining until the end of the year.
- 1537: John Manuel, Prince of Portugal (d. 1554)
- 1540: Charles II of Austria (d. 1590)
- 1865: George V of the United Kingdom (d. 1936)
- 1984: Prince Félix of Luxembourg
- 2006: Countess Leonore of Orange-Nassau, Jonkvrouwe van Amsberg