The Preamble to the Indian Constitution was primarily drafted based on the "Objectives Resolution," which was moved and introduced in the Constituent Assembly by Jawaharlal Nehru on December 13, 1946. This resolution laid down the fundamental principles and philosophy that shaped the Preamble. The Constituent Assembly adopted the Objectives Resolution on January 22, 1947, and later adopted the Preamble along with the Constitution on November 26, 1949, which came into effect on January 26, 1950

. While Jawaharlal Nehru is credited with writing and moving the draft of the Preamble, the actual Constitution, including the Preamble, was hand-written by Prem Behari Narain Raizada, a calligrapher

. Dr. B.R. Ambedkar, as Chairman of the Drafting Committee, played a crucial role in framing the Constitution but did not write the draft of the Preamble itself

. In summary:

• Jawaharlal Nehru wrote and introduced the draft of the Preamble through the Objectives Resolution

• The Preamble was adopted by the Constituent Assembly on November 26, 1949.
• The Constitution was hand-written by Prem Behari Narain Raizada

• Dr. B.R. Ambedkar chaired the Drafting Committee but did not draft the Preamble

Thus, Jawaharlal Nehru is recognized as the author of the Preamble's draft.