| S.No. | Organization | Contact Number |
|---|---|---|
| 1 | D-Link (India) Limited | 1800-233-0000 |
| 2 | D-Link (India) Limited | 1860-233-3999 |
| 3 | D. M. Systems Private Limited (DMS) | 1800-313-1312 |
| 4 | Dabur India Limited | 1800-103-1644 |
| 5 | Dahua Technology India Private Limited | 1800-103-5719 |
| 6 | Daikin Airconditioning India Private Limited | 1860-180-3900 |
| 7 | Daikin Solution Plaza | 1800-102-9300, 1800-229-300 |
| 8 | Dakshin Gujarat Vij Company Limited (DGVCL) | 1800-233-3003 |
| 9 | Dakshin Haryana Bijli Vitran Nigam (DHBVN) | 1800-180-4334 |
| 10 | Darshan Foods | 1800-102-0491 |
| 11 | Dasmesh Mechanical Works Private Limited | 1800-532-6726 |
| 12 | Dax Networks Limited | 1800-4255-329 |
| 13 | Ddecor Home Fabrics Private Limited | 1800-267-9008, 1800-103-9008 |
| 14 | Delhi Development Authority (DDA) | 1800-110-332 |
| 15 | Delhi Transport Corporation (DTC) | 1800-118-181 |
| 16 | Dell International Services India Private Limited | 1800-425-4026 |
| 17 | Den Networks Limited | 1800-419-2020 |
| 18 | Department of Collegiate and Technical Education (DCE) | 1800-425-6178 |
| 19 | Department of Commercial Taxes (DCT), Chhattisgarh | 1800-233-5382 |
| 20 | Department of Commercial Taxes, Madhya Pradesh | 1800-233-0440 |
| 21 | Department of Commercial Taxes, Uttar Pradesh | 1800-180-5223 |
| 22 | Department of Consumer Affairs | 1800-11-4000, 14404 |
| 23 | Department of Excise and Taxation | 1800-180-8087 |
| 24 | Department of Food & Supplies and Consumer Affairs & Legal Metrology | 1800-180-2068 |
| 25 | Department of Forests & Wildlife Preservation | 1800-180-2323 |
| 26 | Department of Higher Education Commissioner, Haryana | 1800-180-2038 |
| 27 | Department of Irrigation and Flood Control | 1800-118-595 |
| 28 | Department of Local Government (DLG), Punjab | 1800-180-00172 |
| 29 | Department of Pharmaceuticals | 1800-180-8080 |
| 30 | Department of Power, GNCTD | 1800-112-222 |
| 31 | Department of Taxes, Manipur | 1800-345-3811 |
| 32 | Department of Tourism | 1800-180-2116 |
| 33 | Department of Tourism | 1800-208-1414 |
| 34 | Department of Tourism & Civil Aviation | 1800-833-3010 |
| 35 | Deputy Medical Commissioner | 1800-180-2027 |
| 36 | Dewan Housing Finance Corporation Limited (DHFL) | 1800-223-435 |
| 37 | Dhanlaxmi Bank Limited | 1800-425-1747 |
| 38 | Dharamshila Narayana Superspeciality Hospital | 1800-309-0309 |
| 39 | Dharamshila Narayana Superspeciality Hospital (DNSH) | 1800-030-90309, 1860-208-0208 |
| 40 | DHL Express (India) Private Limited | 1800-111-345, 1800-200-1345 |
| 41 | DHL Service Point | 1800-111-345 |
| 42 | Digisol Systems Limited | 1800-209-3444 |
| 43 | Director General of Income Tax (Vigilance) & Chief Vigilance Officer | 1800-180-1961 |
| 44 | Director of Income Tax (Vigilance) | 1800-180-1961 |
| 45 | Directorate General of Foreign Trade (DGFT) | 1800-111-550 |
| 46 | Directorate of Agriculture & Farmers Welfare, Haryana | 1800-180-2117 |
| 47 | Directorate of Agriculture & Food Production, Odisha | 1800-345-6769 |
| 48 | Directorate of Industries (DIC) | 1800-270-1213 |
| 49 | Directorate of Social Justice & Empowerment and Minorities | 1800-112-001 |
| 50 | Directorate of Welfare of Scheduled Castes, Backward Classes & Minority Communities, Punjab | 1800-137-0015 |
| 51 | Dixcy Textiles Private Limited | 1800-102-5066 |
| 52 | DLF Limited | 1800-103-3534 |
| 53 | Domino's Pizza | 1800-111-123 |
| 54 | Dr. A.P.J. Abdul Kalam Technical University | 1800-180-0161 |
| 55 | Dr. Babasaheb Ambedkar Open University (BAOU) | 1800-833-1020 |
| 56 | Dr. Babasaheb Ambedkar Research and Training Institute (BARTI) | 1800-233-0444 |
| 57 | Drish Shoes Limited | 1800-137-0107 |
| 58 | DSK Benelli | 1800-266-2324 |
| 59 | Dyson Technology India Private Limited | 1800-258-6688 |
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