Several of the minor characters are highly important to the plot of the novel.
- Rahim Khan serves as a confidant and liaison between Baba and Amir during their peaceful times in Kabul. Later, Khan reveals the truth about Hassan's true father (through Hassan's own letters) and serves as the inspiration and impetus for Amir's return to Taliban-held Afghanistan with his promise to Amir that "There is a way to be good again."
- Sohrab becomes the last remaining link between Hassan and Amir and, in the end, the boy serves as the object of Amir's search for atonement. He avenges his father's death and fulfills a prophecy when he uses his trusty slingshot to blind Assef and save Amir from a fatal beating. He later fulfills the desires of Amir and Soraya to begin a family, serving as both a relation and the son Soraya was unable to bear.
- Amir could never have survived his journey back to Afghanistan without the loyal Farid, who serves as his driver and advisor.
- Amir receives valuable background information about his mother through the "improbable coincidence" of meeting Dr. Rasul, a street beggar and former teacher who remembered that Amir's mother loved "Almond cake with hot tea and honey." With that information, "I had just learned more about my mother from this old man on the street than I ever did from Baba."
- Ali's wife, Sanaubar, serves as a reminder to Amir that even the most undeserving person can change their life and find atonement for their past sins.