Saiful Islam Duke is a retired Lieutenant Commander of Bangladesh Navy.

[1] Duke was a retired Lieutenant Commander of Bangladesh Navy.

He worked as the Personal Secretary to Prime Minister Khaleda Zia.

[2][1] Duke and his brother in law, Directorate General of Forces Intelligence officer Lieutenant Colonel Saiful Islam Joarder were charged with involvement in the 2004 Dhaka grenade attack on former Prime Minister Sheikh Hasina.

[3] He is accused of aiding Maulana Tajuddin, main supplier of the grenades used in the attack and member of terrorist groups based in Pakistan, in fleeing Bangladesh.