As Aaron Bertrand pointed out, you can use the undocumented `xp_regread` in SQL Server 2005 and SQL Server 2008, but there is a better way, starting with SQL Server 2008R2 SP1.

From the article [How to identify the SQL Server Service Account in T-SQL][1], you can use [`sys.dm_server_services`][2] like this:



    SELECT  DSS.servicename,
            DSS.startup_type_desc,
            DSS.status_desc,
            DSS.last_startup_time,
            DSS.service_account,
            DSS.is_clustered,
            DSS.cluster_nodename,
            DSS.filename,
            DSS.startup_type,
            DSS.status,
            DSS.process_id
    FROM    sys.dm_server_services AS DSS;

![SQL Service Account Query Results][3]

[1]: http://sqlity.net/en/1868/identify-sql-server-service-account-in-t-sql/
[2]: https://msdn.microsoft.com/en-us/library/hh204542.aspx
[3]: http://i.imgur.com/HdfsUZF.png

How can I get the Service Account name for the SQL Agent service for a particular SQL Server (SQL 2005).
Is it possible to get using SQL statements or WMI ?

