Ahsan Habib was the third son of Faizur Rahman Ahmed and Ayesha Foyez. His father, a police officer, was killed by the Pakistani army during the liberation war of Bangladesh in 1971. His elder brother, Humayun Ahmed, was a writer and film-maker. Another brother, MuhammedZafarIqbal, is also a writer and educationist. Habib is married to Afroza Amin and they are parents to only child ShabnamAhsan.
Unmad, the Sanskrit word for mad or insane, has been used as the name of a monthly satire magazine in Bangladesh. The magazine was founded by IshtiaqHossain and KaziKhaleed Ashraf in 1978 and tries to ape MAD Magazine. Bangladeshi cartoonist AhsanHabib is its present chief editor.