Adi Dravidar and Tribal Welfare    

Agriculture   

Animal Husbandry  

Archives  (Tamil Nadu Archives and Historical Research)

Backward Classes,  Most Backward Classes & Minorities Welfare   

BC, MBC and Minorities Welfare Department : Career Guidance (PDF File in Tamil)

Birth & Death Certificate  Issual at Town Panchayats

Chennai Corporation

Chennai Metropolitan Water Supply & Sewerage Board

Chennai Metropolitan Development Authority (CMDA)

Civil Supplies

Commercial Tax   

Collegiate Education

Food, Civil Supplies & Consumer Protection Department

Co-operative Department

Department of Inspectorate of Factories

Employment and Training - Employment Wing

Employment and Training - Training Wing

Energy (Tamil Nadu Electricity Board)

Energy (Tamil Nadu Energy Development Agency)

Energy (Electrical Inspectorate)

Finance Department- Pensions & Other Retirement Benefits

Finance Department- Small Savings Scheme  

Fisheries  

Forensic Sciences

Forests

Geology and Mining

Handlooms and Textiles  

Health and Family Welfare

Highways

Hindu Religious and Charitable Endowments   

Information and Public Relations   (Tamil)

Information and Tourism

Information Technology  

Institute for Water Studies

Irrigation

Labour & Employment

Micro , Small and Medium Enterprises Department 
(formerly Small Industries Department)

Metro Water

Municipal Administration : Water Supply, Building  Licence, Name Transfer, etc.

Planning  and  Development (State Planning Commission)

Public Works Department (Buildings Organisation)

Public Works Department (Water Resource Organisation)

Registration

Revenue  

School Education

Sericulture  

Small Industries Development Corporation - Schemes

Social Welfare and Nutritious Meal Programme    

Sports Development Authority Of Tamil Nadu

State Industries Promotion Corporation of Tamil Nadu Limited (SIPCOT)

State Transport Authority

 Sugar

 Stationery and Printing Department

Tamil Nadu Adi-Dravidar Housing Development Corporation (TAHDCO)  

 Tamil Nadu Backward Classes and Minorities Economic
 Development Corporation

 Tamil Nadu Cements Corporation Ltd.

 Tamil Nadu Coop. Housing Federation

 Tamil Nadu Coop. Milk Producers Federation Ltd. (Aavin)

 Tamil Nadu Energy Development Agency (TEDA) 

 Tamil Nadu Fisheries Development Corporation Ltd.

 Tamil Nadu Housing Board

 Tamil Nadu Industries Investment Corporation

 Tamil Nadu Integrated Nutrition Project

 Tamil Nadu Magnesite Limited

 Tamil Nadu Minerals Limited

 Tamil Nadu Newsprint and Papers Limited  

 Tamil Nadu Police  

 Tamil Nadu Pollution Control Board

 Tamil Nadu Poultry Development Corporation

 Tamil Nadu Salt Corporation Limited

 Tamil Nadu Slum Clearance Board

 Tamil Nadu Traders Welfare Board

 Tamil Nadu Veterinary and Animal Sciences University

 Tamil Nadu Wakf Board  

 Targeted Public Distribution System

 Technical Education (DOTE)

 Tourism

 Town and Country Planning Department

 Town Panchayats Directorate (DTP)

 Transport