| D2H 18001023111 |
| Dabur Chyawan Junior 18001022310 |
| Daenyx 18002007171 |
| Daikin Air Conditioners – 1800 444 222 18001029300, 1800229300 |
| Dakshinanchal Vidyut Vitaran Nigam Limited 18001803007 |
| Data One Broadband – 1800 424 1800 |
| Datamatics Finanacial Services 1800228666 |
| Datawind 18001802180 |
| Dax Networks 18004255329 (DAX) |
| DBS Cholamandalam Asset Management 18002097575 |
| D'damas 1800225455 18001024480/2 |
| Deccan Charters 18001031034 |
| Dehradun Institute of Tech 18002004200 |
| Delhi Commission for Women (DCW) 1800119292 |
| Delhi Police Recruitment 18001020898 |
| Delhi VAT Helpline 1800110066 |
| Dell – 1800444026 18004254026/9 18004258107 18004254004 |
| Dell Telephone Technical support 18004258045 18004259046 |
| Dell Mobile 18004254050 |
| Delta Airlines 1800225200 |
| Dena Bank 1800225740 |
| Dena Bank Card Loss 1800225086 |
| Dengue Diagnosis J. Mitra & Co 18001030880 |
| Destination Doorstep 18001032228 |
| Dettol 18001031818 |
| Deutsche Postbank Home Finance Limited 18001034446 |
| Development Credit Bank – 1800 22 5769 |
| Dewan Worldwide Holidays 1800117888 |
| DEXL IIT JEE 18001806691 |
| Dhanlakshmi Bank 18004251747 |
| DHFL Dewan Housing Finance Corporation Limited 1800223435 |
| DHL Couriers 18002255345 1800111345 18002001345 |
| Dial BPO Jobs 180030003003 |
| Digi Telly 18004192020 |
| Digital TV [ Airtel ] 18001028080 |
| Disc Technology Services 18004256669 |
| DishTV – 1800 12 3474 18001038585 1800 180 3474 |
| Divy Power 18002333344 |
| Diya Diamonds 18001024482 |
| DLF Homes 18001033534 (DLFH) |
| DLF Pramerica Life Insurance (DPLI) 18001027070 |
| DLink 1800222002 |
| Domino's Pizza – 1800 111 123 |
| Doordarshan Lucknow 18001802233 |
| Dr Batra's Super Speciality Homeopathy 18002096767 1800226767 1800116767 |
| Drinko 18002094030 |
| DRS Transport (P) Ltd 1800114321 |
| DSK Supinfocom International Campus (DSKSIC) 18002095020 |
| DSP Blackrock MF 18002004499 18003454499 |
| DSP Merrill Lynch 18003454499 |
