Gary Lee Littrell (born October 26, 1944) is a retired United States Army command sergeant major who, while serving as an adviser to Army of the Republic of Vietnam's Ranger units during the Vietnam War, acted with extraordinary courage during a four-day siege on his battalion, for which he was awarded the Medal of Honor.

Unrelentingly, over four days, Littrell kept the battalion inspired, while he directed artillery and air support, distributed ammunition, strengthened faltering defenses, cared for the wounded, and shouted encouragement to the Vietnamese in their own language.

Currently, he speaks to students through his own foundation, Tribute To Valor, where he promotes the six core values of The Medal of Honor: courage, sacrifice, patriotism, citizenship, integrity, and commitment.

When addressing high school students in the area, he emphasizes the significance of leading a virtuous life, highlighting that "Integrity is the most important word in the world.

"[4] In October 2024, Littrell joined 15 other Medal of Honor recipients in publicly endorsing Donald Trump for president.