How to center a label text in WPF?

use the HorizontalContentAlignment property.

Sample

<Label HorizontalContentAlignment="Center"/>

The Control class has HorizontalContentAlignment and VerticalContentAlignment properties. These properties determine how a control’s content fills the space within the control.
Set HorizontalContentAlignment and VerticalContentAlignment to Center.

You have to use HorizontalContentAlignment="Center" and! Width="Auto".