1604 (MDCIV) was a leap year starting on Thursday in the Gregorian calendar and a leap year starting on Sunday in the Julian calendar.

Millennium: 2nd millennium
Centuries: 16th century17th century18th century
Decades: 1570s  1580s  1590s  – 1600s –  1610s  1620s  1630s
Years: 1601 1602 160316041605 1606 1607

Events change