Mstyslav Andriiovych Chernov is a Ukrainian filmmaker, war correspondent, videographer, photographer, photojournalist, and novelist. A Pulitzer Prize and Academy Awards winner known for his coverage of the Revolution of Dignity, War in Donbas, the downing of flight MH17, Syrian civil war, Battle of Mosul in Iraq, and the 2022 Russian invasion of Ukraine, including the Siege of Mariupol.

20 Days in Mariupol is a 2023 Ukrainian documentary film directed by Mstyslav Chernov.