A graduate school or ("grad school") is a school that awards advanced degrees, such as doctoral degrees with the general requirement that students must have earned a previous undergraduate (bachelor's) degree. Many universities award graduate degrees; a graduate school is not necessarily a separate institution. Original research experience is often a significant component of graduate studies, including the writing and defense of a thesis or dissertation. The term "graduate school" is primarily North American. Additionally, in North America, the term does not usually refer to medical school (whose students are called "medical students"), and only occasionally refers to law school or business school (the latter types of programs are often collectively termed "professional schools.")

Those attending graduate schools are called graduate students, or in British English postgraduate students, or, colloquially, postgrads. Degrees awarded by graduate schools include, master's degrees, doctoral degrees, and other postgraduate qualifications such as graduate certificates and professional degrees.

Although graduate school programs are distinct experiences from undergraduate degree programs, graduate instruction (in Australia, the United States, and other countries) is often offered by some of the same senior academic staff and departments that teach undergraduate courses. Unlike in undergraduate programs, however, it is rare for graduate students to take coursework outside their specific field of study at graduate/Graduate Entry level. At the Ph.D. level, though, it is quite common to take courses from a wider range of study, for which some fixed portion of coursework, sometimes known as a residency, is typically required to be taken from outside the department and college of the degree-seeking candidate, to broaden the research abilities of the student. Some institutions designate separate graduate versus undergraduate staff and denote other divisions (often called School of X, e.g., diplomacy)

Admission

Generally, the Australian higher education system follows that of its British counterpart. Programmes are divided into coursework-based and research-based degrees, and entrance is decided by merit (entrance to coursework-based programmes is usually not as strict); most universities usually require a "Credit" average (equivalent to the British B-) as entry to their taught programmes in a field related to their previous undergraduate. On average, however, a strong "Credit" or "Distinction" average is the norm for accepted students.

Ph.D. entrance requirements in the higher ranked schools typically require a student to have a master's degree by research, or a master's with a significant research component. Those who hold a first-class four-year honours degree may be considered, but are usually first admitted as probationary Ph.D.-students during the first year, then transfer to permanent candidacy contingent upon successful progress. The minimum duration of a Ph.D. programme is two years, but completing within this timespan is unusual, with Ph.D.s usually taking an average of three to four years to be completed.