Windows Azure SQL Database (旧称 SQL Azure, SQL Server Data Services 或 SQL Services) 是由微软SQL Server 2008为主，建构在Microsoft Azure云端操作系统之上，运行云端运算 (Cloud Computing)的关系数据库服务 (Database as a Service)，是一种云存储(Cloud Storage)的实作，提供网络型的应用程序数据保存的服务。

Microsoft Azure SQL Database (formerly SQL Azure, SQL Server Data Services, SQL Services, Windows Azure SQL Database) is a cloud-based service from Microsoft offering data-storage capabilities (similar to Amazon Relational Database Service) as a part of the Azure Services Platform. Unlike similar cloud-based databases, SQL Database allows users to make relational queries against stored data, which can either be structured or semi-structured, or even unstructured documents. SQL Database features querying data, search, data analysis and data synchronization.