Trenno is a district ("
quartiere") of
Milan,
Italy, part of the
Zone 8 administrative division of the city. It borders on green areas to the north and west (on the Boscoincittà city park) and to the south (on the Parco di Trenno); to the east, it is adjacent to the
Gallaratese district. Before being annexed to Milan, in 1923, it was an autonomous
comune.