The 18th century in the United States refers to the period in the United States from 1701 through 1800 in the Gregorian calendar. For articles on this period, see:

• Category:18th century in the United States
• History of the United States series:
  • Colonial history of the United States
  • History of the United States (1776 1789)
  • History of the United States (1789 1849)
• Timeline of United States history