Series 90 may refer to:
Aircraft edit
- Express Series 90, an American homebuilt aircraft design
Computing edit
- UNIVAC Series 90, mainframe computers
- Series 90 (software platform), a platform for mobile phones that uses Symbian OS
- UNIVAC Series 90, line of mainframe computers
Trains edit
- JNR 90 series, prototype of JNR 101 series electric multiple unit