Hadj Mohammed Mesfewi (died June 13, 1906), called the "Marrakesh Arch-Killer", was a Moroccan serial killer who murdered at least 36 women.

Assisted by a 70-year-old woman named Annah, Mesfewi killed young women who came to his shop to dictate letters.

Moroccan authorities found the remains of 20 mutilated bodies in a deep pit under his shop, while another 16 were discovered in the garden outside.

[4] However, public sentiment in Marrakesh was for him to suffer so every day he was led from his cell, into the market square, and lashed ten times with a rod made from thorny acacia, for four weeks.

[2] It was finally decided because of the heinous nature of his crimes and as a warning for all, Mesfewi would be walled up alive in the Marrakesh marketplace bazaar on June 11, 1906.