The 11th Infantry Brigade is an inactive infantry brigade of the United States Army. It was first formed as part of the 6th Division during World War I. It is best known for its service with the 23rd Infantry Division from 1967 through 1971 in the Vietnam War as a light infantry brigade. The brigade is known for its responsibility in the My Lai Massacre.

The 6th Infantry Division was an infantry division of the United States Army active in World War I, World War II, and the last years of the Cold War. Known as "Red Star", it was previously called the "Sight Seein' Sixth".