Dhaka College Nizam Mohammad Serajul Alam Khan (6 January 1941 – 9 June 2023), commonly known as Serajul Alam Khan (Bengali: সিরাজুল আলম খান), also called as Dada, Dadabhai and by his initials SAK, was a Bangladeshi politician, political analyst, philosopher and writer who spearheaded the Bangladesh liberation movement under the leadership of Sheikh Mujibur Rahman but also became one of the controlling forces of political polarization in post-independence Bangladesh.

He, along with others, founded the Swadhin Bangla Biplobi Parishad (which came to be known as 'Nucleus'), a secret organization whose existence is not directly documented but strongly supported by popular hearsay and conventional history.

[3] Khan as a student of the University of Dhaka created the Nucleus whose aim was the Independence of East Pakistan along with Kazi Aref Ahmed and Abdur Razzaq.

[5][unreliable source][6][additional citation(s) needed] Together with other members of the Nucleus, Khan created the Bangladesh Liberation Force and an armed wing called the Joy Bangla Bahini which would be present throughout East Pakistan by 1970.

[4] Soon after returning to free the country from dissension within the pro-liberation mainstream power base, Khan became conspicuous between left-of-centre leadership and simmering far-left young radicals.

[8] He developed an ideological difference from Sheikh Fazlul Haque Mani, due to the former's advocacy of scientific socialism, thus forming the Jatiyo Samajtantrik Dal.