September 26 holds an important place in Indian history, particularly in the fields of social reform, education, science, politics, cinema and cricket. The date marks the birth anniversary of Ishwar Chandra Vidyasagar, one of the leading figures of the Bengal Renaissance, and former Prime Minister Dr Manmohan Singh.

It is also associated with the foundation of the Council of Scientific and Industrial Research (CSIR) and the birth anniversaries of several Indian actors and sportspersons. Globally, September 26 is observed as the International Day for the Total Elimination of Nuclear Weapons and World Contraception Day.
One of the most significant Indian events associated with September 26 is the birth of Ishwar Chandra Vidyasagar in 1820. A prominent scholar, educator and social reformer, Vidyasagar played an important role in promoting women's education and supporting widow remarriage in 19th-century Bengal. His work made him an important figure of the Bengal Renaissance.
September 26 is also associated with the foundation of the Council of Scientific and Industrial Research (CSIR). CSIR observes September 26 as its Foundation Day, marking its role in India's scientific and industrial research ecosystem.
Another notable Indian associated with this date is Dr Manmohan Singh, who was born on September 26, 1932. An economist and statesman, he served as Prime Minister of India from 2004 to 2014. The Prime Minister's Office has officially commemorated his birth anniversary on September 26.
Ishwar Chandra Vidyasagar (1820): Social reformer, educator, writer and key figure of the Bengal Renaissance.
Dr Manmohan Singh (1932): Economist, former Prime Minister and former Finance Minister of India.
Subedar Joginder Singh (1921): Indian Army soldier and recipient of the Param Vir Chakra, India's highest wartime gallantry award.
Dev Anand (1923): Legendary Hindi film actor, producer and director who became one of the most recognisable personalities of Indian cinema.
September 26 is the birthday of several Indian entertainment personalities. Chunky Pandey (1962) is a well-known Hindi film actor, while Niki Aneja Walia (1972) is an actress known for television and film work. Anjali Patil (1989) and Madalsa Sharma (1991) are among the younger-generation actresses associated with the date.
The date is particularly notable for Dr Manmohan Singh, who served as India's Prime Minister for two consecutive terms. Other political figures born on September 26 include T. M. Thomas Isaac (1952) and S. S. Krishnamoorthy (1959). Historical political figures associated with the date include Lourdammal Simon, born in 1912.
Several Indian cricketers share their birthday with September 26. Vijay Manjrekar (1931) represented India in Test cricket, while Anshuman Pandey (1975) and Jyoti Yadav (1977) are also listed among Indian cricketers born on this date. More recent domestic players include Atharva Ankolekar (2000) and Joseph Lalthankhuma (2000).
Among the notable Indian personalities who died on September 26 are Laxmanrao Kirloskar (1956), industrialist and founder associated with the Kirloskar industrial group; T. B. Cunha (1958), an important figure in the Goan freedom movement; Uday Shankar (1977), pioneering dancer and choreographer; and Hemanta Mukherjee (1989), celebrated singer and composer.
The International Day for the Total Elimination of Nuclear Weapons is observed every year on September 26. The United Nations established the observance to raise awareness about nuclear disarmament and encourage international efforts towards eliminating nuclear weapons. In 2026, September 26 falls on a Saturday, with the UN's high-level commemorative meeting scheduled for September 29.
World Contraception Day is also observed annually on September 26. The day focuses on awareness of contraception and informed reproductive health choices.
September 26 brings together important milestones in Indian social reform, science, politics, cinema and sports. The birth anniversaries of Ishwar Chandra Vidyasagar and Dr Manmohan Singh, CSIR's Foundation Day, and the remembrance of notable Indians who died on this date make September 26 significant for students studying Indian history and important days.