Pennsylvania Route 90

Pennsylvania Route 90 can refer to:
 * Pennsylvania Route 90 (1920s-1960s), now numbered 191
 * New Jersey Route 90, which becomes an unnumbered road in Pennsylvania
 * Interstate 90 in Pennsylvania - the current route with the SR 90 designation.
 * Pulaski Expressway - a planned expressway, which was supposed to have the PA 90 designation.