81 may refer to:

• 81 (number)
• one of the years 81 BC, AD 81, 1981, 2081
• Nickname for the Hells Angels Motorcycle Club. "H" is the eighth letter of the alphabet, and "A" is the first.
• 81 Terpsichore, a main-belt asteroid

• All pages with titles containing 81
• List of highways numbered 81
• Tatra 81, a heavy-duty truck

Topics referred to by the same term

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