There are few as influential events in Hungarian history as World War I, which resulted in Hungary losing two-thirds of her territory, half of her population, two-thirds of her rail, road and canal networks and 80% of her mines and forests.The Paris treaties that were meant to bring peace again to Europe following “the war that was to end all wars” caused only revanchism and extreme nationalism in the defeated countries that inevitably lead to a word scale confrontation once again. In my thesis I intend to examine the British foreign policy and general attitude in these troubled decades, to shed light on what part the British as a prominent power of the time played in the reshaping of Europe in general and Central Europe and Hungary in particular; I wish to achieve this by exploring three questions, namely how the British came to favour the dismemberment of the Austro-Hungarian Monarchy, what kind of role Britain played in the creation of the Treaty of Trianon, and what characterized the British attitude towards Hungary’s revisionist foreign policy in the 1920s.