Accreditation exists at both the institutional level and the program level for graduate and professional school, so it is important to look for both a school (college/university) and a program (PhD/MA/MS in [subject]) that is accredited in order to find good programs.
Below is a list of links for finding accredited programs. If your area is not represented here, try doing a Google search using "[your program area]" + "accredited colleges or universities".
ABET- applied science, computing, engineering & technology
Council for Accreditation of Counseling & Related Educational Programs (CACREP)
Psychology (clinical, counseling, and school)
Public Affairs, Policy, & Administration
How does a school become accreditated?