Rubén Ruiz Ibárruri (Russian: Рубе́н Руи́с Иба́ррури; January 9, 1920 – September 3, 1942) was a Spanish military officer and Soviet commander of the 100th Machine Gun Company of an independent training battalion of the 35th guards rifle division of the 62nd army of the Stalingrad Front.

[4] During February 1939, Ibárruri crossed the Pyrenees into France, with the remnants of the defeated Republican Popular Army, and was interned in the Argelès-sur-Mer concentration camp.

[7] After recovering, Lieutenant Ibárruri joined the 35th Guards Rifle Division, which was formed from the 8th Airborne Corps in August 1942,[8] as the commander of the 100th Machine Gun Company.

When arriving in the area, the division was rushed to the village of Samofalovka, 30 kilometres north-west of Stalingrad, to halt the advance of the German army toward the Volga River.

Ibárruri's battalion, commanded by Captain A.A. Stolyarov, was deployed in the Kotluban train station and immediately attacked by German forces.

In the morning, he was hit by a bullet in the abdomen and sent to a field hospital in Srednyaya Akhtuba - a town on the other side of the Volga, 20 kilometres east of Stalingrad.