National Mathematics Day was observed on December 22, 2025, commemorating the birth anniversary of legendary mathematician Srinivasa Ramanujan. The Government of India declared December 22 as National Mathematics Day in 2012 to honour Ramanujan's extraordinary contributions to number theory, mathematical analysis, infinite series, and continued fractions.

Educational programmes, seminars, and mathematics-related activities were conducted across schools, colleges, and universities throughout India. The National Board for Higher Mathematics and various IITs organised special lectures and competitions to promote mathematical thinking among students.