X90 may refer to
Car models Proton X90 Jetour X90 Suzuki X-90 X90, the Toyota Cresta model from 1992 to 1996 X90, the Toyota Mark II model sold in Japan from 1992 to 1996
Bus routes X90, an Oxford to London coach route, England X90 (New York City bus)
Other Pentax X90, predecessor to the Pentax X-5 camera Vivo X90, smartphone by Vivo