India possesses nuclear weapons and previously developed chemical weapons. Although India has not released any official statements about the size of its nuclear arsenal, recent estimates suggest that India has 180 nuclear weapons. India has conducted nuclear weapons tests in a pair of series namely Pokhran I and Pokhran II.

India is a member of three multilateral export control regimes — the Missile Technology Control Regime, Wassenaar Arrangement and Australia Group. It has signed and ratified the Biological Weapons Convention and the Chemical Weapons Convention. India is also a subscribing state to the Hague Code of Conduct. India has signed neither the Comprehensive Nuclear-Test-Ban Treaty nor the Nuclear Non-Proliferation Treaty, considering both to be flawed and discriminatory. India previously possessed chemical weapons, but voluntarily destroyed its entire stockpile in 2009 — one of the seven countries to meet the OPCW extended deadline.

India maintains a "no first use" nuclear policy and has developed a nuclear triad capability as a part of its "credible minimum deterrence" doctrine. Its no first use is qualified in that while India states it generally will not use nuclear weapons first, it may do so in the event of "a major attack against India, or Indian forces anywhere, by biological or chemical weapons."

India has ratified the Biological Weapons Convention (BWC) and pledges to abide by its obligations. There is no clear evidence, circumstantial or otherwise, that directly points toward an offensive BW program. India does possess the scientific capability and infrastructure to launch an offensive BW program. In terms of delivery, India also possesses the capability to produce aerosols and has numerous potential delivery systems ranging from crop dusters to sophisticated ballistic missiles. No information exists in the public domain suggesting interest by the Indian government in the delivery of biological agents by these or any other means. To reiterate the latter point, in October 2002, then-President A. P. J. Abdul Kalam asserted that "India will not make biological weapons. It is cruel to human beings".

In 1992, India signed the Chemical Weapons Convention (CWC), becoming one of the original signatories of the CWC in 1993, and ratified it on 2 September 1996. According to India's ex-Army Chief General Sundarji, a country having the capability of making nuclear weapons does not need to have chemical weapons, since the dread of chemical weapons could be created only in those countries that do not have nuclear weapons. Others suggested that the fact that India has found chemical weapons dispensable highlighted its confidence in the conventional weapons system at its command.

In June 1997, India declared its stock of chemical weapons (1,045 tonnes of sulphur mustard). By the end of 2006, India had destroyed more than 75 percent of its chemical weapons/material stockpile and was granted an extension for destroying the remaining stocks by April 2009 and was expected to achieve 100 percent destruction within that time frame. India informed the United Nations in May 2009 that it had destroyed its stockpile of chemical weapons in compliance with the international Chemical Weapons Convention, making it the third country, after South Korea and Albania, to do so. This was cross-checked by inspectors of the United Nations.

India has an advanced commercial chemical industry, and produces the bulk of its chemicals for domestic consumption. It is also widely acknowledged that India has an extensive civilian chemical and pharmaceutical industry and annually exports considerable quantities of chemicals to countries such as the United Kingdom, the United States, and Taiwan.

As early as 26 June 1946, Jawaharlal Nehru, soon to be India's first Prime Minister, announced: