Lago di Alserio is an Italian lake located in the Province of Como, Brianza, Lombardy. On its shores lie the communes of Erba, Albavilla, Alserio and Monguzzo. The lake falls within the Parco regionale della Valle del Lambro, the regional park of the valley of the Lambro. Along its eastern shore is located a nature reserve known as the “Riva orientale del Lago di Alserio.”