Born on 15 December 1888 in Palpa, Nepal, to Haria Gulte.
Thapa was a 26-year-old Rifleman in the 2nd Battalion, 3rd Queen Alexandra’s Own Gurkha Rifles, British Indian Army, during the First World War when the following deed took place for which he was awarded the Victoria Cross. On 25 September 1915 in Fauquissart, France Rifleman Kulbir Thapa, having been wounded himself, found a wounded soldier of The Leicestershire Regiment behind the first-line German trench (believed to be a 20-year-old soldier from Melton Mowbray by the name of Bill Keightley). Although urged to save himself, the Gurkha stayed with the wounded man all day and night. Early next day, in misty weather, he dragged him through the German wire, within spitting distance from the Germans, and, leaving him in a place of comparative safety, returned and brought in two wounded Gurkhas, one after the other. He then went back, and, in broad daylight, fetched the British soldier, carrying him most of the way under enemy fire.
Such an incredible act of faith and courage had by now attracted a good deal of attention, and when he emerged from his trench for the third time with one more wounded comrade over his shoulder, the German soldiers actually clapped their hands to encourage the Gurkha on. Only this time, the Gurkha walked right across the No-Mans-Land back to his own side.
The Victoria Cross awarded to Kulbir Thapa was in the first group of awards for the Battle of Loos which were gazetted on 18 November 1915. Of the 18 VCs gazetted that day no less than 17 were presented by the King at Buckingham Palace in nine presentations between December 1915 and January 1917. Kulbir Thapa rejoined his battalion in Egypt on 4 January 1916 and no record as to when he received his medal has been located.
He later achieved the rank of Havildar.