An oak leaf cluster or oak leaves is a common device which is placed on U.S. military awards and decorations to denote those who have received more than one bestowal of a particular decoration. The number of oak leaf clusters typically indicates the second and subsequent award of the decoration.

Most military awards use bronze, silver, and gold oak leaf clusters. The higher ranking oak leaf clusters are issued in lieu of a greater number of lower ranking clusters, allowing a large number of award annotations to fit on a single ribbon. For instance, five bronze oak leaf clusters would be denoted by one silver and five silver by one gold.