Ivan Markulj (Mostar, February 11, 1889 – Belgrade, September 1945) was a Croatian soldier, officer in the armies of the Austro-Hungarian Monarchy, the Kingdom of Yugoslavia, and the Independent State of Croatia.

As the first commander of the 369th Reinforced Infantry Regiment, Ivan Markulj managed to create a solid military unit from a group of inexperienced and undisciplined volunteers and very few experienced officers in a short period of time and in very difficult conditions on the unstable Russian front, whose combat successes were admired by their German comrades and officers.

[citation needed] After the heavy fighting and success of the 369th Reinforced Infantry Regiment in the battles near Kharkov in the spring of 1942, Colonel Markulj was awarded the Iron Cross of the First Class by order of the German general, commander of the 100th Chasseur Division Werner Sanne.

In May 1945 he retreated from the Partisans together with the Croatian Armed Forces to Austria and the West, where he surrendered to the Western Allies, but was soon extradited to the Yugoslav military authorities.

The Yugoslav military court in Belgrade in September 1945 sentenced General Markulj, along with a larger group of captured Ustaša officers, to death by firing squad.