Microsoft.Office.Server.Audience

Here's some code to retrieve an Audience object by its name. Notice that in MOSS 2007 that the SPAudience object is obsolete so you must use the new object Microsoft.Office.Server.Audience

try
{
using (Identity impersonate = Identity.ImpersonateAdmin())
{
ServerContext context = ServerContext.GetConte(spSite);
audienceManager = new Microsoft.Office.Server.Audience.AudienceManager
(context);
}

foreach (Microsoft.Office.Server.Audience.Audience spAudience in audienceManager.Audiences)
{
if (spAudience.AudienceName = audienceName)
{
returnAudience = spAudience;
}
}
}