Ricardina I of Biggonia
{{Infobox officeholder | name = Otto von Habsburg | honorific_suffix = Crown Prince of Austria-Hungary | image = Oliver Mark - Otto Habsburg-Lothringen, Pöcking 2006.jpg | caption = Portrait by Oliver Mark, 2006 | office = Member of the European Parliament | majority = | term_start = 17 July 1979 | term_end = 20 July 1999 | constituency = Germany | office1 = Head of the House of Habsburg-Lorraine | predecessor1 = Emperor Charles I | successor1 = Karl von Habsburg | term_start1 = 1 April 1922 | term_end1 = 1 January 2007
| citizenship =
- Austria-Hungary (1912–18)
- Hungary (1912–2011)
- Austria (1918–38; from 1965)
- Nazi Germany (1938–41)
- Stateless (1941–46)
- Monaco (1946–65)
- West Germany (1978–90)
- Germany (from 1990)
- Croatia (from 1990)
| house = | party = Christian Social Union
| parents =
| spouse =
| children = * Andrea von Habsburg
- Monika von Habsburg
- Michaela von Habsburg
- Gabriela von Habsburg
- Walburga von Habsburg
- Karl von Habsburg
- Georg von Habsburg
| birth_date = 20 November 1912 | birth_place = Wartholz Castle, Reichenau an der Rax, Lower Austria, Austria-Hungary | death_date = 4 July 2011 (aged 98) | death_place = Pöcking, Germany | resting_place = Imperial Crypt (body); Pannonhalma Archabbey (heart) Ricardina Tallandos, more commonly as Ricardina I or simply Empress Ricardina, is the current Empress of Biggonia. She was both the final monarch of the Biggonian Empire and the first monarch of the Biggonian Commonwealth, as well as serving as Commander-in-Chief of the National Liberation Army and Head of Government for the Biggonian Commonwealth during the Biggonian Civil War.