September 18 is an important date in Indian history, particularly for events connected with the freedom movement, national security and the integration of princely states. The date is associated with the conclusion of Operation Polo in 1948, which led to the surrender of the Hyderabad State forces and the integration of Hyderabad into the Indian Union.

September 18 is also remembered for the Uri terror attack of 2016, in which Indian Army personnel were killed.
The day also marks the birth anniversaries of several notable Indians, including revolutionary Madan Lal Dhingra, actress Shabana Azmi, writer Kaka Hathrasi and badminton player Ashwini Ponnappa. Several Indian cricketers, including Amit Pagnis, Mohit Sharma and Aditya Shrivastava, were also born on this date.
Operation Polo Ends in 1948
On September 18, 1948, Operation Polo came to an end after the Nizam's forces in Hyderabad surrendered to the Indian Army. The military action, also known as the Hyderabad Police Action, had begun on September 13, 1948. The surrender marked a major step in the integration of Hyderabad into the Indian Union.
Uri Terror Attack of 2016
On September 18, 2016, a group of heavily armed terrorists attacked an Indian Army administrative base in Uri, Jammu and Kashmir, in the early morning. According to the Ministry of Defence, four attackers were killed and 17 Army personnel lost their lives in the initial attack. The incident became a major event in India's security and diplomatic history.
The United Nations also issued a statement condemning the attack and expressing condolences to the families of the soldiers who were killed.
On September 18, 1803, British forces captured Puri during the Second Anglo-Maratha War. The event formed part of the British expansion in the Odisha region.
Madan Lal Dhingra
Indian revolutionary Madan Lal Dhingra was born on September 18, 1883. He became associated with India's revolutionary movement while studying in Britain and was executed in 1909 for the assassination of British official William Hutt Curzon Wyllie.
Shabana Azmi
Veteran actress Shabana Azmi was born on September 18, 1950. She is known for her extensive work in Hindi cinema and has received several national and international honours.
Kaka Hathrasi
Hindi poet and humourist Kaka Hathrasi was born on September 18, 1906. He became popular for his satirical and humorous poetry.
Vishnuvardhan
Sampath Kumar known by his stage name as Vishnuvardhan, was an Indian actor who predominantly in Kannada cinema besides also having sporadically appeared in Tamil, Hindi, Telugu and Malayalam language films.
Ashwini Ponnappa
Indian badminton player Ashwini Ponnappa was born on September 18, 1989. She has represented India in international badminton and won major medals in women's doubles and mixed doubles competitions.
Other Indians born on September 18 include writer and politician Shrikant Verma, actor Vinay Rai, actress Sanaya Irani, and Maharaja Digvijaysinhji Ranjitsinhji Jadeja.
September 18 is associated with the birthdays of several Indian political personalities, including:
Several Indian cricketers have birthdays on September 18.
Amit Pagnis was born on September 18, 1978, while Aditya Shrivastava was born on September 18, 1993.
September 18 is also remembered for the death anniversaries of several notable Indians.
International Equal Pay Day is observed every year on September 18. The United Nations proclaimed the day in 2019, with the observance beginning in 2020. It highlights the principle of equal pay for work of equal value and draws attention to persistent gender pay gaps around the world.
World Bamboo Day is celebrated annually on September 18. The World Bamboo Organization established the observance in 2009 to increase awareness about bamboo and its environmental, economic and social importance. In 2026, the organisation is highlighting bamboo's potential for sustainability, livelihoods, restoration and innovation.
September 18 has significance in Indian history because of the conclusion of Operation Polo and the integration of Hyderabad, as well as the 2016 Uri terror attack. The date also recalls important figures from India's freedom struggle, literature, cinema and sports.
Globally, September 18 is observed as International Equal Pay Day, while World Bamboo Day highlights the sustainable uses of bamboo. These historical events, personalities and observances make September 18 a notable date in India's historical calendar.