Lostallo is a municipality in the Moesa Region in the Swiss canton of Graubünden.

Of the rest of the land, 1.8% is settled (buildings or roads) and the remainder (32.3%) is non-productive (rivers, glaciers or mountains).

It consists of the village of Lostallo and the hamlets of Cabbiolo to the north and Sorte to the south.

[7] The age distribution, as of 2000[update], in Lostallo is; 80 children or 12.2% of the population are between 0 and 9 years old.

[6] In the 2007 federal election the most popular party was the SP which received 35.3% of the vote.