Does one get Graduate Diploma by special entry without having degree In USA?

No, in the USA, you generally cannot get a graduate diploma through special entry without a bachelor's degree. Graduate diplomas are postgraduate qualifications, meaning they require a prior undergraduate degree (a bachelor's degree) for admission. While some programs might have slightly less stringent requirements for *specific* prior experience, they almost never waive the fundamental need for a bachelor's degree or its equivalent. The "special entry" typically refers to alternative pathways *into* a bachelor's program, not into a graduate-level program like a graduate diploma.