MSDE，又称为 Microsoft Database Engine、Microsoft Data Engine 或 SQL Server Desktop Edition 等等，是以微软 SQL Server 7.0 与 SQL Server 2000 核心为主的小型数据库引擎，在大部份的使用情况下是免费，而且可以转散布的数据库（若要取得商用软件的转散布，则需要注册才行），目前已由 SQL Server Express 接替。

MSDE 最令人诟病的，就是它只能使用指令来管理，除了使用 SQL Server Enterprise Manager 可连接以外，没有图形化的管理工具，而且功能也稍嫌单薄，最大的可共用用户数只有8个，在扩充性上也受到了限制。

Microsoft SQL Server Data Engine (MSDE, also Microsoft Data Engine or Microsoft Desktop Engine) is a relational database management system developed by Microsoft. It is a scaled-down version of Microsoft SQL Server 7.0 or 2000 which is free for non-commercial use as well as certain limited commercial use. It was introduced at Microsoft TechEd in May 1999, and was included as part of Microsoft Office 2000 Developer Edition. Its successor, SQL Server Express was released in November 2005. Vendor support of MSDE ended on April 8, 2008.