Mohammadabad-e Chahak (, also Romanized as MoḩammadÃÂbÃÂd-e ChÃÂhaḵ; also known as MoḩammadÃÂbÃÂd and MuhammadÃÂbÃÂd) is a village in Paskuh Rural District, Sedeh District, Qaen County, South Khorasan Province, Iran. At the 2006 census, its population was 519, in 131 families.