In philately, a block of 4 is a grouping of four unseparated stamps from the same sheet, preserved together to retain their original layout and markings. India Post issued several commemorative stamp blocks in 2025, honoring historic milestones, organizations, and prominent personalities.

Notable 2025 Indian commemorative stamp blocks include:

80 Years of the United Nations: Features India’s participation in the UN milestone. The stamps depict a dove carrying the Indian tricolor flag against a blue and earth-tone gradient background, marked with a UN emblem.

150 Years of Vande Mataram: A patriotic and colorful tribute marking the 150th anniversary of India’s iconic national song

100 Years of the Association of Indian Universities: Released on December 22, 2025, to commemorate the century-long legacy of the AIU.

National Centre for Polar and Ocean Research (NCPOR): Issued on December 1, 2025, in Goa to celebrate the 25th anniversary (Silver Jubilee) of India’s polar research initiatives.

Personality & Historical Blocks: Includes specialized mint stamps such as the Chandrabhanu Gupta personality stamp block, and blocks honoring historical figures like Ahilya Bai Holkar and Rani Chennabhairradevi.