The 19th century in the United States refers to the period in the United States from 1801 through 1900 in the Gregorian calendar. For information on this period, see:

• Category:19th century in the United States
• History of the United States series:
  • History of the United States (1789 1849)
  • History of the United States (1849 1865)
  • History of the United States (1865 1918)
• Timeline of the United States