1Z

1Z may refer to:

Helicopters

 * AH-1Z; see H-1 upgrade program, US military helicopter program
 * Bell AH-1Z Viper
 * AH-1Z Super Cobra; see Bell AH-1 SuperCobra

Other

 * SSH 1Z (WA); see List of former state highways in Washington
 * A prefix for tracking numbers used by United Parcel Service