Bangalore, India 

1. Check out the SEED (Class 3-5 level), SOW (high school and PUC level) and REAP (undergraduate level) programmes at the  Jawaharlal Nehru Planetarium, Bangalore

2. Apply for a summer school at MP Birla Institute of Fundamental Research in Bangalore - for all ages. Children as young as twelve years old would attend some of the sessions.

3. Attend public seminars at the Indian Institute of Astrophysics (IIAp) Bangalore and get in touch with the research staff to work on a project with them. They also conduct workshops for students over the summer - email the staff to know what's on offer that year.

4.  Visiting student programme at the Raman Research Institute (RRI), Bangalore

5.  For an astronomy PhD programme, check out the JAP - jointly run by IIAp, RRI and ISRO.

6. International Centre for Theoretical Sciences (ICTS) Bnagalore conducts really interesting Summer Courses as well as Long Term Visiting Students Programme

    Mumbai/Pune, India

7. Visiting student programme at NCRA Mumbai. They also conduct Radio Astronomy Schools in the winter. See other programmes here.

8. If you're interested in astrobiology, check out IARC Mumbai

9. Inter-University Centre for Astronomy and Astrophysics (IUCAA) in Pune offers an Introductory Summer School in astronomy and astrophysics. They also offer programmes for school students here

10.  For advanced undergraduate or graduate students (BSc as well as engineering), check out Vacation Students Programme at IUCAA Pune

Across India / Other cities / Online

In general, it is a good idea to send an email to professors at universities in your city to ask if they have small projects you can help with.

11. Learn about really interesting topics in astronomy and physics organised by AstronEra here. AstronEra is an initiative run by Shweta Kulkarni, a really inspiring Astropreneur.

12. For more general physics programmes, check out the TIFR Visiting Students' Research Programme 

13. You can visit the Ooty Radio Telescope (ORT) here. 

14. Learn more about the Vainu Bappu Observatory here.

15. For undergraduates, Dorrit Hoffleit Undergraduate Research Scholarship at Yale University, USA 

Amateur Astronomy Clubs / Associations

If you're interested in astrophotography, observing with your own telescope, or working with a group of amateur astronomers, check out some really cool clubs below (list to be updated):

16. Delhi Amateur Astronomers Association Delhi (AAAD) 

17. Karnataka Bangalore Astronomical Society, Amateur Astronomy Club NITK Surathkal 

18. Kerala Amateur Astronomers Organization Kerala 

19. Maharashtra Amateur Astronomy Group Pune, Amateur Astro Club Mumbai 

Specifically for (Indian) women

20. ICTS in Bangalore organises Summer School for Women in Physics every year, you can find details about it along with other interesting courses here .

21. Mentorship programme led by Michelle Lochner, Supernova Foundation (I highly recommend it, I'm still in touch with my mentor after 5+ years!)

22.  If you're a woman of Indian origin in cosmology/astronomy, join our group, CARINA. Subscribe to the newsletter here, and get in touch with me to join the Whatsapp group / Slack channel or send an email to carina.cosmoastrow[at]gmail.com. This is an initiative led by Prakrithi PalChoudhury. See a list of current members here.

(Funded) opportunities outside India

1. LEAPS summer programme, Leiden, Netherlands

2. Young Scientist Programme at the Blue Marble Space Institute of Science, Seattle, Washington USA

3. Summer Internships abroad - This is a really nice list of available opportunities, but bear in mind that not all of them are open to Indian citizens and may not be fully funded either