Mohammad Hossein Mahdavian is an Iranian film director and screenwriter. He's best known for his films Standing in the Dust (2016), Midday Adventures (2017), Lottery (2018), Walnut Tree (2020) and Mortal Wound (2021).

Walnut Tree is a 2020 Kurdish- Iranian biographical war drama film directed by Mohammad Hossein Mahdavian and written by Ebrahim Amini and Hossein Hassani. it revolves around the Chemical bombing of Sardasht of 1987. The film screened for the first time at the 38th Fajr Film Festival and received 11 nominations. Mahdavian won a Crystal Simorgh for Best Director and Maadi won the Crystal Simorgh for Best Actor for his performance.