Gratosoglio (Italian: [ɡratoˈsɔʎʎo]; Milanese: Grattasoeuj [ɡrataˈsøj])[1] is a district (quartiere) of the city of Milan, Italy, part of the Zone 5 administrative division.

It is located at southernmost end of the city, bordering on the comune of Rozzano, and it is traversed by the Lambro river.

Having started as a commuter town in the 1960s, with large prefabricated apartment blocks destined to house immigrant workers coming from the South of Italy, the district is usually listed among those most degraded (e.g., having the highest crime rates) in the surroundings of Milan.

The name Gratosoglio is derived from the Latin words gratum solium "agreeable throne", which apostle Barnabas (founder of the Milanese church), according to a local legend, pronounced when he was about to leave Milan.

The local rural community survived the decay of the monastery, and in the 18th century was annexed to the Corpi Santi comune.