Since popular examples are already stated here by others, I am including other street foods across India, some of which are my favourites.
All picture credits to Google Images and the owners of the pics.
- Maddur vada - savoury fritter from Karnataka
2. Mysore bonda- deep-fried dumplings
3. Ros omelette- Evening/night time snack from Goa, omelette served with chicken curry and warm rolls
4. Pazham pori- Tea-time Kerala snack of batter fried banana
5. Kothu parotta- spicy curried shreds of parotta with vegetables, egg or meat. Tamil Nadu speciality
6. Bhurji pav- Scrambled eggs Mumbai style
7. Roasted shakarkandi- sweet potato, Delhi
8. Besan ka chilla- Chandni Chowk, Delhi
9. Aloo kabli chaat- Kolkata
10. Jhaal muri- West Bengal, Jharkhand, Odisha
11. Kathi roll- Kolkata
12. Dahi bara, aloo dum- Anywhere in Odisha
13. Parippu vada- chana dal fritters from South India, esp Kerala
14. Surti locho- lentil snack from Gujarat
15. Sev khamani- Cousin to above, also from Gujarat
16. Mirchi bada- Rajasthan
17. Kheema pav- Mumbai
18. Litti chokha- Bihar
19. Dhuska ghugni- Jharkhand
20. Bombay Sandwich
21. Misal pav- Maharashtra. Regional variants exist, matki is the usual pulse used. Misal lovers insist on topping up with the spicy tari.
22. Hurda bhel-Maharashtra. Winter time chhat made with lightly roasted tender sorghum (jowar)
23. Daulat ki chaat/Malayo/Malai Makkhan/Nimish- North India, only available in winter, till end of February. It is a delight, although it is just milk fat foam served lightly sweetened.
24. Punugulu chutney- Andhra Pradesh, Telangana. Deep fried idli batter.
25. Pesarattu upma-Andhra Pradesh, Telangana. Semolina upma with moong dal dosa.
26. Chana jor garam- Inexpensive chickpea snack popular all over North India
27. Baida roti- Mumbai version of the meat stuffed Mughlai egg paratha. Ramzan special.
28. Sindhi Dal Pakwan- Breakfast dish of spicy channa dal and crisp pastry.
29. Egg Devil aka Dimer Chop- Kolkata. Fish, meat and vegetarian choice also popular but this one is my favourite :) Enjoyed with kasundi
30. Thukpa- Tibetan noodle and vegetable soup, the Nepalese version is spicier.
