Is August 15th a day of obligation for all Roman Catholics? August 15th on which the assumption of St. Mary, mother of Jesus is commemorated by the  Catholic Church is a day of obligation for the Roman Catholics in India. I wish to know if the day is one of obligation for the universal Catholic Church, or is the practice restricted to India which commemorates its independence from British rule on the same day ?
The Assumption of the Blessed Virgin Mary is a holy day of obligation for the entire universal Church (Code of Canon Law, 1246 §1).

At the same time it should be recalled that the conference of bishops can suppress or transfer some holy days of obligation with the permission of the Apostolic See (Code of Canon Law, 1246 §2).

See also: What are the Holy Days of Obligation? (Catholic Answers)