Amateur radio or ham radio is practised by more than 22,000 licensed users in India. The first amateur radio operator was licensed in 1921, and by the mid-1930s, there were around 20 amateur radio operators in India. Amateur radio operators played an important part in the Indian independence movement with the establishment of illegal pro-independence radio stations in the 1940s. The three decades after India's independence saw only slow growth in the number of operators until the then Prime Minister of India and amateur radio operator, Rajiv Gandhi (VU2RG), waived the import duty on wireless equipment in 1984. Since then, numbers have picked up, and as of 2007, there were more than 16,000 operators in the country. Amateur radio operators have played a vital role during disasters and national emergencies such as earthquakes, tsunamis, cyclones, floods, and bomb blasts, by providing voluntary emergency communications in the affected areas.

Congress Radio, also known as Azad Radio, was an underground radio station that operated for about three months during the Quit India Movement of 1942, a movement launched by Mahatma Gandhi against the British Raj for independence of India. Congress Radio was the broadcasting mouthpiece of the Indian National Congress and functioned from different locations in Bombay, present-day Mumbai, and briefly from Nashik. It was organized by Usha Mehta (1920–2000), then a 22-year student activist, with the help of amateur radio operators. Others who were involved included Vithalbhai Jhaveri, Vitthaldas Khakar, Chandrakant Jhaveri, and Babubhai Thakkar. The broadcasting equipment was supplied by Nanik Motwane of Chicago Radio, Bombay. Prominent leaders of the Indian independence movement like Ram Manohar Lohia, Achyutrao Patwardhan, and Purushottam Trikamdas were also associated with Congress Radio.