1.1

1.1 may refer to:


 * 1.1.1.1, a Domain Name System service
 * 1.1-inch/75-caliber gun
 * Falcon 9 v1.1 orbital launch vehicle
 * Trabant 1.1, an automobile
 * A one-day Category 1 race in the UCI race classifications system
 * A software version number, including:
 * HTTP 1.1, a version of the Hypertext Transfer Protocol first published in 1997
 * SAML 1.1, a version of Security Assertion Markup Language ratified in 2003