You can do Diploma from Some of the top colleges such as IHMs

Indian Institute of Hotel Management (IIHM)
Lovely Professional University
Dr. Ambedkar Institute of Hotel Management
Indian Institute of Hotel Management and Culinary Arts
Oberoi Centre of Learning and Development
Merit Swiss Asian School of Hotel Management
Welcome Group Graduate School of Hotel Administration
Rizvi College of Hotel Management

GESTO Culinary & Hospitality Academy

Hello dear, 

Some of the very good institutes from where you can pursue diploma course in hotel management are: 

• Asian institute of hospitality and tourism, noida
• Delhi hotel management institute, new delhi
• UEI Global- hotel management, delhi
• Delhi institute of hotel management and catering technology, new delhi
• Amity school of hospitality, noida

For more information, visit the official site of these institutes. 

All the best!