• Harvard law school
• Faculty of law oxford university
• Faculty of law University of Cambridge
• Yale law school
• Newyork University
• Stanford law school
• London school of economics and political science law department
• Malbourne law school
• University of chicago law school
• University of California

As your question was particularly related to study abroad 

I'll assist you in this, see as you especially demanded top law universities for post graduation, I'll write the best colleges for you 

1) Yale university

2) Univesity of california, berkley

3) New york univeristy, NYC

4) Stanford univeristy 

5) Harvard university 

6) Univeristy of cambridge 

7) columbia university 

Hello Chavali,  The top LAW universities for Post Graduation are as follow:

1. ILS, Pune

2. DU, Delhi

3. National Law School of India University (NLSIU) , Banglore

4. Amity University - Amity Law School , Noida

5. University of Mumbai - Department of Law

6. Jamia Millia Islamia University , Delhi

7. Osmania University , Hydrabad

8. Symbiosis International Educational Centre (SIEC) , pune

9. Allahabad University , Allahabad

10. National Law University (NLU), Jodhpur

All the best

If you wish to get admission in top Law universities for LLM programme then you need to appear for CLAT PG entrance exam which is a National level Exam. You can check top law universities given below:

National Law School of India University, Bangalore   

National Academy of Legal Studies and Research, Hyderabad
   
National Law Institute University, Bhopal

West Bengal National University of Judicial Sciences, Kolkata
   
National Law University, Jodhpur

Hidayatullah National Law University, Raipur

Gujarat National Law University, Gandhinagar

Ram Manohar Lohiya National law University, Lucknow

Rajiv Gandhi National Law University, Patiala

Chanakya National Law University, Patna
   
National University of Advanced Legal Studies, Kochi
   
National Law University Odisha, Cuttack

National University of Study and Research in Law, Ranchi
   
National Law University and Judicial Academy, Guwahati

Tamil Nadu National Law School, Trichy
   
Damodaram Sanjivayya National Law University, Vishakhapatnam
   
Maharashtra National Law University, Mumbai

Good Luck!