SAARC South Asian Association for Regional Cooperation
SAC Space Application Centre
SAFTA  South Asian Free Trade Agreement
SAI Sports Authority of India
SAIL Steel Authority of India Limited
SAPTA South Asian Preferential Trade Arrangement
SARS Severe Acute Respiratory Syndrome
SC Security Council/Supreme Court
SCI Shipping Corporation of India
SCOPE Standing Conference of Public Enterprises
SCRA Special Class Railway Apprentice
SCSI Small Computer Systems Interface
SDR Special Drawing Rights
SEBI Securities and Exchange Board of India
SENSEX Sensitivity Index (of Share Price)
SEZ Special Economic Zone
SGPC Siromani Gurudwara Prabandak Committee
SHAR Shri Harikota Range
SIM Subscriber Information Module
SIS Secret Intelligence Service (U.K)
SITA Suppression of Immoral Traffic in Women and Girls Act
SlDBI Small Industries Development Bank of India
SLV Satellite Launch Vehicle
SMS Short Message Service
SMTP Simple Mail Transfer Protocol
SPCA Society for the Prevention of Cruelty of Animals
SPIC MACAY Society for the Promotion of Indian Classical music and culture
SRS  Sample Registration System
STARS Satellite Tracking and Ranging Station
STD Subscriber Trunk Dialling; Sexually Transmitted Diseases
STPI Software Technology Parks of India
SWAPO South West African People's Organisation
TA Traveling Allowance/Territorial Army
TADA Terrorist and Disruptive Activities (Prevention) Act
TC Transfer Certificate, Trusteeship Council
TCP Transfer Call Protocol<br> Transmission Control Protocol
TELCO Tata Engineering and Locomotive Company
TELEX Tele-printer Exchange
TERCOM Terrain Contour Matching
TFT Thin-Film Transistor
TIFR Tata Institute of Fundamental Research
TISCO Tata Iron and Steel Company
TNT Tri-nitro-toluene
TOEFL Test of English as a Foreign Language
TRAI Telecom Regulatory Authority of India
TRIPS Trade Related Intellectual Property Rights
TTE Traveling Ticket Examiner
TTFI Table Tennis Federation of India
TWA Trans World Airlines (USA)