Mystki-Rzym [ˈmɨstki ˈʐɨm] is a village in the administrative district of Gmina Wysokie Mazowieckie, within Wysokie Mazowieckie County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 3 kilometres (2 mi) south of Wysokie Mazowieckie and 50 km (31 mi) south-west of the regional capital Białystok.