Select By Material allows you to select objects based on the active material in the Material Editor. This command is unavailable unless the active sample slot contains a material used in the scene.
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(Material Editor): Compact > (Select By Material)
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(Slate Material Editor: Toolbar > )
Choosing this command opens the Select Objects dialog, which works like Select From Scene. All objects that have the selected material applied to them are highlighted in the list.
Note: Hidden objects don't appear in this list, even if the material is applied to them. However, in the Material/Map Browser, you can choose Browse From: Scene, turn on By Object, and then browse from the scene. This lists all objects in the scene, hidden and unhidden, along with their assigned materials.