Start by searching all web sites that end with the government domain .gov. Include the word data then add any other word that will help define the type of data you're looking for, ex.: site:.gov data domestic violence. Use the Google search box below to complete your search from this guide.
Search nonprofits NGOs for data by searching web sites using the .org domain. Here's an example search - site:.org data HIV
Google Labs also offers Google Public Data Explorer which provides access to a number of open international data sets along with ways to visualize this data as charts and maps.
Here are some other Library Research Guides created by other librarians on finding and using data.