Alexander "Sandy" Bonnyman Jr. (May 2, 1910 – November 23, 1943) was a United States Marine Corps officer who was killed in action on Betio Atoll in the Gilbert Islands during World War II.

A combat engineer, he received the Medal of Honor and Purple Heart posthumously for his actions during an important assault on a Japanese bombproof shelter during the Battle of Tarawa.

Bonnyman's civilian background, temperament and skills would come to play an important role at Tarawa in November 1943, where he was assigned to a shore party handling beachhead logistics.

On the second day of the struggle, Bonnyman, determined to breach the enemy's strong defensive line, led a demolition team of 21 Marines in an assault on the entrance to a huge bombproof shelter which contained approximately 150 Japanese soldiers.

Bonnyman again pressed his attack and gained the top of the structure, thereby flushing more than one hundred of its occupants into the open where they were cut down by Marine infantry and a supporting tank.

He was interred with full military honors and an overflight of Marine Corps Cobra helicopters in "missing man formation" next to his parents and siblings at West Knoxville's Berry Highland Memorial Cemetery on September 27, 2015.

Acting on his own initiative when assault troops were pinned down at the far end of Betio Pier by the overwhelming fire of Japanese shore batteries, 1st Lt. Bonnyman repeatedly defied the blasting fury of the enemy bombardment to organize and lead the besieged men over the long, open pier to the beach and then, voluntarily obtaining flame throwers and demolitions, organized his pioneer shore party into assault demolitionists and directed the blowing of several hostile installations before the close of D-day.

Determined to effect an opening in the enemy's strongly organized defense line the following day, he voluntarily crawled approximately 40 yards forward of our lines and placed demolitions in the entrance of a large Japanese emplacement as the initial move in his planned attack against the heavily garrisoned, bombproof installation which was stubbornly resisting despite the destruction early in the action of a large number of Japanese who had been inflicting heavy casualties on our forces and holding up our advance.

Withdrawing only to replenish his ammunition, he led his men in a renewed assault, fearlessly exposing himself to the merciless slash of hostile fire as he stormed the formidable bastion, directed the placement of demolition charges in both entrances and seized the top of the bombproof position, flushing more than 100 of the enemy who were instantly cut down, and effecting the annihilation of approximately 150 troops inside the emplacement.

Assailed by additional Japanese after he had gained his objective, he made a heroic stand on the edge of the structure, defending his strategic position with indomitable determination in the face of the desperate charge and killing 3 of the enemy before he fell, mortally wounded.