14 March - Act III of 1921 passed by the National Assembly. The so-called "order law" invests powers in the government to protect the social order against communists and other radicals[1]
27 March - Easter Crisis: Charles IV returns to Hungary at Szombathely
28 March - Easter Crisis: Charles IV negotiates with Horthy in Budapest. Horthy refuses to resign power. Charles IV returns to Szombathely.[2]
6 August - Inter-Allied General Committee publishes the plan for the transfer of Burgerland from Hungary to Austria in 3 stages (A, B and C Zone).[8]
9-10 August - Pact between Czechoslovakia and Austria. Czechoslovakia would support Austrian territorial claims and LoN loan, Austria denounces Habsburg restoration attempts.[1]
14 August - Serbian–Hungarian Baranya–Baja Republic declared
21 August - Serbian–Hungarian Baranya–Baja Republic dissolved
3 October - Hungarian forces leave Zone B and C.[15]
4 October - Pál Prónay declares the independent state of Lajtabánság in Burgerland
7 October - Austro-Hungarian negotiations begin in Venice with Italian mediation[16]
13 October - Venice Agreement between Hungary and Austria
17-18 October - Legitimists plot a coup against Horthy in west Hungary[14]
20 October - Charles IV returns to Hungary for the second time via airplane landing at Dénesfa at the Cziráky estates[17]
22 October - 04:30 - Telegraph notifies the Government about Charles IV's return[18]
23-24 October - Battle of Budaörs, Charles IV halted before entering Budapest
24 October - Czechoslovakia and Kingdom of Serbs, Croats and Slovenes issue an ultimatum to Hungary to resist and overthrow the Habsburgs, threaten military intervention.[19]
25 October - II. Army of Lajtabánság under Miklós Budaházy enters the Sopron plebiscite zone with 400 men and overthrows the legitimist government.[20]
27 October - 6/II Infantry Battalion replaces paramilitaries in Sopron[20]
31 October - Prónay and his officers summoned to Horthy in person, ordered the evacuation of Lajtabánság by 5 November[21]
1 November - Charles IV leaves Hungary for the last time
5 November - Rongyos Gárda leaves Burgerland, Lajtabánság dissolved
6 November - The People's Assembly dethrones the House of Habsburg-Lorraine (1921:XLVII Act)[22]
11 November - Inter-Allied General Committee, after notified by Hungary that the paramilitaries were evacuated, orders Austria to take control of Burgerland, except for the Sopron plebiscite zone.[23]
13-15 November - Austria takes over North Burgerland (north of Sopron)
19 November - Charles IV arrives to Madeira
25-29 November - Austria takes over Central and South Burgerland (south of Sopron)