Mariam Petrosyan (Armenian: Մարիամ Պետրոսյան, born 10 August 1969) is an Armenian painter, cartoonist, and Russian-language novelist. She is most well-known as the author of the award-winning novel The Gray House (2009), translated into eight languages.

Following college, Petrosyan became a cartoonist at the Studio of Armenfilm in 1989. She subsequently moved to Moscow and worked at Soyuzmultfilm Studio. In 1995, she returned to Armenfilm, where she worked until 2007. She is married to Artashes Stamboltsan. They have two children. Petrosyan is a great-granddaughter of the Armenian painter Martiros Saryan.