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

Soazza is first mentioned in 1203 as Soaza.

Soazza has an area, as of 2006, of 46.4 km (17.9 sq mi). Of this area, 7.2% is used for agricultural purposes, while 53.7% is forested. Of the rest of the land, 1.5% is settled (buildings or roads) and the remainder (37.7%) is non-productive (rivers, glaciers or mountains).

Soazza has a population (as of 31 December 2020) of 324. As of 2008, 11.9% of the population was made up of foreign nationals. Over the last 10 years the population has decreased at a rate of -6.9%. Most of the population (as of 2000) speaks Italian (91.9%), with German being second most common ( 3.3%) and Serbo-Croatian being third ( 2.2%).

As of 2000, the gender distribution of the population was 54.4% male and 45.6% female. The age distribution, as of 2000, in Soazza is; 37 children or 10.3% of the population are between 0 and 9 years old. 17 teenagers or 4.7% are 10 to 14, and 10 teenagers or 2.8% are 15 to 19. Of the adult population, 35 people or 9.7% of the population are between 20 and 29 years old. 64 people or 17.8% are 30 to 39, 49 people or 13.6% are 40 to 49, and 42 people or 11.7% are 50 to 59. The senior population distribution is 51 people or 14.2% of the population are between 60 and 69 years old, 37 people or 10.3% are 70 to 79, there are 16 people or 4.5% who are 80 to 89, and there is 1 person who is 90 to 99.

In the 2007 federal election the most popular party was the CVP which received 34.9% of the vote. The next three most popular parties were the SP (28.5%), the SVP (26%) and the FDP (9.2%).

In Soazza about 73.3% of the population (between age 25-64) have completed either non-mandatory upper secondary education or additional higher education (either university or a Fachhochschule).

Soazza has an unemployment rate of 2.6%. As of 2005, there were 24 people employed in the primary economic sector and about 9 businesses involved in this sector. 71 people are employed in the secondary sector and there are 7 businesses in this sector. 38 people are employed in the tertiary sector, with 14 businesses in this sector.

The historical population is given in the following table:

year	population
1650	427
1802	311
1850	315
1900	339
1950	348
2000	359

The Casa Paret, the Church of S. Martino including the della Madonna Addolorata and the Ospizio e Via Crucis are listed as Swiss heritage sites of national significance.

• 
  Church of S. Martino
• 
  Church of S. Martino

• Official website (in Italian and German)
• Soazza in German, French and Italian in the online Historical Dictionary of Switzerland.