811 may refer to:

• 811 (number), a number in the 800s range
• 811 AD, a year in the Common Era
• 811 BC, a year Before the Common Era

• Route 811, see List of highways numbered 811
• 811 Nauheima, an asteroid in our Solar System, the 811th asteroid registered

• Flight 811 (disambiguation)
• 811 series, a Japanese electric multiple unit train class
• IAR 811, a Romanian training airplane

• 8-1-1, an N-1-1 telephone number in North America for non-urgent services

• All pages with titles beginning with 811
• All pages with titles containing 811
• 81 (disambiguation)