S81
# S81

S81 may refer to:

## Aviation

* Blériot-SPAD S.81, a French fighter aircraft
* Indian Creek USFS Airport, in Valley County, Idaho, United States
* Short S.81, an experimental British biplane seaplane

## Other uses

* S81 (New York City bus) serving Staten Island
* County Route S81 (Bergen County, New Jersey)
* Daihatsu Hijet (S81), a kei truck and microvan
* Spanish submarine Isaac Peral (S-81), a S-80 Plus class submarine
* Stola S81 Stratos, a concept car
* S81, a line of the St. Gallen S-Bahn
* S81, a postcode district for Worksop, England
* BenQ-Siemens S81, a BenQ mobile phone
