Casa Toninello, Rationalist residential building in Milan, Italy.

Casa Toninello is a small apartment building at Via Perasto 3, in Milan's Isola district. It occupies a narrow lot 12 metres wide and 28 metres deep, with two blocks—one on the street and one at the rear—linked by a balcony leading to a central stair. The reinforced-concrete frame has longitudinal pillars supporting three bays, and the facade's grid of projections and recesses ends in a top cornice.

Cesare Toninello, an entrepreneur who made his fortune starching and laundering shirt collars, commissioned the house from Pietro Lingeri and Giuseppe Terragni. They built it between 1933 and 1935, during the partnership that produced several apartment buildings in Milan.

The client was Cesare Toninello, an entrepreneur who made his fortune washing and ironing starched collars, and the house carries his name. The building belongs to the series of apartment blocks Lingeri and Terragni designed together in Milan in the 1930s, applying rationalist methods to an ordinary commission rather than a public monument.

The building is located at Via Perasto 3 in Milan and can be viewed from the street to appreciate its architectural form. Visitors can observe the facade and its features at any time of day, with the clean lines becoming especially clear in good daylight.

The client, Cesare Toninello (1879–1937), made his fortune washing and starching collars, and the house carries his name. The lot is only 12 metres wide and 28 metres deep, so the two blocks are joined by an external walkway leading to a staircase set mid-lot.