Back 81 (توضيح) Arabic 81 (dəqiqləşdirmə) Azerbaijani ٨١ (ڕوونکردنەوە) CKB ۸۱ Persian 81 (menm non) HT 81 (disambigua) Italian 81 (سلجهائپ) Sindhi 81 SHN 81 (rozlišovacia stránka) Slovak 81 (แก้ความกำกวม) Thai
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