TCS' directly-held subsidiaries include:
- AP Online Limited (India)
- C-Edge Technologies Limited (India)
- CMC Limited (India)
- Diligenta Limited (UK)
- Exegenix Canada Inc. (Canada)
- Tata America International Corporation (USA)
- Tata Consultancy Services Asia Pacific Pte Limited (Singapore)
- Tata Consultancy Services Belgium S.A. (Belgium)
- Tata Consultancy Services Deutschland GmbH (Germany)
- Tata Consultancy Services France S.A. (France)
- Tata Consultancy Services Netherlands B.V. (Netherlands)
- Tata Consultancy Services Sverige AB (Sweden)
- Tata Consultancy Services Switzerland Ltd (Switzerland)
- Tata Infotech (Singapore) Pte. Limited * (Singapore)
- Tata Infotech Deutschland GmbH * (Germany)
- TCS FNS Pty. Limited (Australia)
- TCS Iberoamerica S.A. (Uruguay)
- WTI Advanced Technology Limited (India)
TCS' indirectly held subsidiaries include:
- CMC Americas Inc. (USA)
- Swedish Indian IT Resources AB (Sweden)
- Tata Information Technology (Shanghai) (China)
- Tata Consultancy Services Solution Center S.A. (Uruguay)
- TCS Argentina S.A. (Argentina)
- TCS Brazil S/C Limitada (Brazil)
- Tata Consultancy Services de Mexico S.A. De. C.V. (Mexico)
- TCS Inversiones Chile Limitada (Chile)
- Tata Consultancy Services de Espana S.A. (Spain)
- Tata Consultancy Services Do Brasil S.A. (Brazil)
- Tata Consultancy Services Chile S.A. (Chile)
- TCS Italia SRL (Italy)
- Tata Consultancy Services Japan Limited (Japan)
- Tata Consultancy Services Malaysia SDN. BHD. (Malaysia)
- Tata Consultancy Services Luxembourg S.A Capellen (G.D. de Luxembourg)
- Tata Consultancy Services Portugal Unipesoal Limitada (Portugal)
- Tata Consultancy Services Chile Limitada (Chile)
- Comicrom S.A. (Chile)
- Sisteco S.A. (Chile)
- Syscrom S.A. (Chile)
- Pentacrom S.A. (Chile)
- Pentacrom Servicios S.A. (Chile)
- Custodia De Documentos Intres Limitada (Chile)
- Financial Network Services (Holdings) Pty Limited (Australia)
- Financial Network Services Pty Limited (Australia)
- Financial Network Services (Facilities Management) Pty Limited (Australia)
- Financial Network Services (Europe) plc (UK)
- Financial Network Services Malaysia Sdn Bhd (Malaysia)
- TCS Financial Network Services (Indonesia)
- Chong Wan Investments Limited (Hong Kong)
- Financial Network Services (Africa) Pty Ltd. (South Africa)
- Financial Network Services Chile Limitada (Chile)
- Financial Network Services (H.K.) Limited (Hong Kong)