Herbert Joseph Thomas Jr. (February 8, 1918 – November 7, 1943) was a United States Marine who was awarded the Medal of Honor for his actions during World War II.

Thomas was posthumously awarded the Medal of Honor for his actions during combat versus Japanese army forces on the battle of Koromokina Lagoon (on November 7, 1943).

When the grenade struck vines and fell back into the midst of the group, Sergeant Thomas deliberately flung himself upon it to smother the explosion, valiantly sacrificing his life for his comrades.

Inspired by his selfless action, his men unhesitatingly charged the enemy machine gun and, with fierce determination, killed the crew and several other nearby defenders.

The splendid initiative and extremely heroic conduct of Sergeant Thomas in carrying out his prompt decision with full knowledge of his fate reflect great credit upon himself and the United States Naval Service.