General Sir Richard Nugent O'Connor, KT, GCB, DSO & Bar, MC (21 August 1889 – 17 June 1981) was a senior British Army officer who fought in both the First and Second World Wars, and commanded the Western Desert Force in the early years of the Second World War. He was the field commander for Operation Compass, in which his forces destroyed a much larger Italian army – a victory which nearly drove the Axis from Africa, and in turn, led Adolf Hitler to send the Afrika Korps under Erwin Rommel to try to reverse the situation. O'Connor was captured by a German patrol on 6 April 1941 and spent over two years in an Italian prisoner of war camp. He eventually escaped after the fall of Mussolini in the autumn of 1943. In 1944 he commanded VIII Corps in the Battle of Normandy and later during Operation Market Garden. In 1945 he was General Officer in Command of the Eastern Command in India and then, in the closing days of British rule in the subcontinent, he headed Northern Command. His final job in the army was Adjutant-General to the Forces in London, in charge of the British Army's administration, personnel and organisation.

In honour of his war service, O'Connor was recognised with the highest level of knighthood in two different orders of chivalry. He was also awarded the Distinguished Service Order (twice), the Military Cross, the French Croix de Guerre and the Legion of Honour, and served as aide-de-camp to King George VI. He was also mentioned in despatches nine times for actions in the First World War, once in Palestine in 1939 and three times in the Second World War.

Richard Nugent O'Connor was born in Srinagar, Kashmir, India, on 21 August 1889. His father, Maurice O'Connor, was a major in the Royal Irish Fusiliers, and his mother, Lilian Morris, was the daughter of a former governor of India's central provinces. He attended Tonbridge Castle School in 1899 and The Towers School in Crowthorne in 1902. In 1903, aged 13, and after his father's death in an accident, he moved to Wellington College. "His career there was not distinguished in any way", however, although he enjoyed his time there.

Following this, he went to the Royal Military College at Sandhurst in January 1908. Despite his success in later life, his time there, as at Wellington (only a few miles away from Sandhurst), was not remarkable, and he did not mention his time there even in his later life. A year ahead of him at the college was a man who would play a significant role in O'Connor's future military career and life. This was Bernard Montgomery, about two years older than O'Connor, although it is unknown if the two men knew of each other at this very early stage of their military careers.

Passing out 38th in the order of merit, in September of the following year O'Connor, anxious to join a Scottish regiment, was commissioned, as a second lieutenant and posted to the 2nd Battalion of his new regiment, Cameronians (Scottish Rifles), the regiment of his choice, recruiting from Glasgow and Lanarkshire, and with which he was to maintain close ties with for the rest of his life. The battalion was initially stationed in Aldershot when O'Connor joined them in October 1909 before being rotated, in January 1910, to Colchester. It was here where he received signals and rifle training, after attending courses for both, resulting in his being appointed a regimental signals officer for the former, and becoming a distinguished marksman after attending the Small Arms School at Hythe, Kent. In September 1911 the battalion sailed for Malta where it was to remain for the next three years as part of a Malta brigade, with O'Connor, now a lieutenant (having been promoted to that rank in May), continuing in his role as regimental signals officer. By now it was becoming obvious that a war in Europe was on the horizon. As a result, for O'Connor, who at some point was appointed the Malta brigade's signals officer, the years of 1913 and 1914 were spent in training the men under his command for the duties that they would one day have to perform in battle.

During the First World War, O'Connor initially served as signals officer of the 22nd Brigade in the 7th Division and captain in command of the 7th Division's Signals Company. From October 1916, as a captain and later as a brevet major, he served as brigade major of 91st Brigade, 7th Division. He was awarded the Military Cross (MC) in February 1915. In March of that year he saw action at Arras and Bullecourt. O'Connor was awarded the Distinguished Service Order (DSO) and appointed brevet lieutenant-colonel while he was in command of the 2nd Infantry Battalion of the Honourable Artillery Company, part of the 7th Division, in June 1917. The citation for his DSO reads:

For conspicuous gallantry and resource. In consequence of a change in the situation a revision of plans became necessary, but, owing to darkness and heavy shelling, confusion arose. By his courage and promptness he quickly restored order, and organised a successful attack.

In November of that year, the division was ordered to support the Italians against the Austro-Hungarian forces at the River Piave which then formed part of the Italian Front. In late October 1918 the 2nd Battalion captured the island of Grave di Papadopoli on the Piave River for which O'Connor received the Italian Silver Medal of Military Valor and a Bar to his DSO.