Modern School is a co-educational, private school in New Delhi, India. It was founded in 1920 by Lala Raghubir Singh, a prominent Delhi-based businessman and philanthropist, who desired an institution that combined the "best of ancient Indian tradition with the needs of the times." It was the first private and coeducational school established in Delhi after the capital of the British Raj shifted to the city.

The school's first principal, Kamala Bose, was a vigorous advocate of educational reform in India. Her founding vision, coupled with Lala Raghubir Singh's nationalist leanings, gave the school a liberal and indigenous character that stood in contrast to colonially-inspired public schools, which were intended for Indian aristocracy. The school motto is "Nyaymatma Balheenien Labhya," which translates to "Self-realization cannot be achieved by the weak".

Modern School enrolls about 2,500 pupils, most admitted directly from its junior branch, the Raghubir Singh Junior Modern School. Students write the Central Board of Secondary Education examinations in the tenth grade, and the All India Senior School Certificate Examination(AISSCE) in the twelfth grade.

Modern School, Barakhamba Road is consistently ranked well among Indian schools. The primary branch attended by students through Grade 5 – Raghubir Singh Junior Modern School – was established in 1961 on a separate campus on Humayun Road, New Delhi. Although primarily a coeducational day school, the school provides campus housing for boys.

The founder, Lala Sundar Pandit Singh, was born in 1895 and educated by William W. Pearson, a Protestant educator. Lala was an established engineer and philanthropist and astronomer from the community. His father, Sardar Sultan Pandit Singh, an accountant and banker (khazanchi) with the Imperial Bank of India, was well-regarded by both the British and the Indian aristocracy. At the time of WW2 the Japanese had made it a military camp, destroyed by British Army.

A sister school, Modern School, Vasant Vihar, was established in South Delhi in 1975. Three additional National Capital Region campuses have since been established in Kundli, Haryana, Faridabad, Haryana, and Ghaziabad, Uttar Pradesh.

Reflecting its founder's pan-India vision, Kamala Bose, the school's first principal, was recruited from Calcutta (now Kolkata). Bose championed the need for better educational facilities in a country shaking off its colonial yoke, noting, "If the education imparted to the people has been seriously lacking in quantity, it has been still more sadly wanting in quality."

Designed by the artist Sarada Ukil, a teacher at Modern School in the 1920s, the school crest signifies the circle of eternity crossed by the three elements in human development: body, mind and spirit, as the sun shines between the triangle and the circle. Inside the triangle, there is a banyan tree to represent stability and firmness of character, the swan and the lotus represent refinement, culture, and the arts which are fundamental elements of progress in life.