| Conventional Long Name: | Republic of Kugelmugel |
| Common Name: | Kugelmugel |
| Loctext: | 2., Antifaschismusplatz 1, Prater, Vienna, Austria |
| Leader Name1: | Mag. Linda Treiber |
| Established Date1: | 19 December 1976 |
Kugelmugel, officially the Republic of Kugelmugel (German: Republik Kugelmugel), is a micronation located in Vienna, Austria. It came about as the result of a dispute between Austrian artist Edwin Lipburger and Viennese authorities, whose permission was required for him to build a spherical house.
The 'Republic' is currently administered by Linda Treiber.
In June 1982, the house was installed in Prater park, near the Hauptallee, and surrounded by eight-foot-tall barbed-wire fences. The house occupies the only address within the proclaimed Republic: "2., Antifaschismusplatz" ("2nd district of Vienna; Anti-Fascism Square"), and since been officially adopted by the city of Vienna. Lipburger died in January 2015, but the Republic retains an official population of more than 650 non-resident citizens. Closed for sometime during the COVID-19 pandemic, it was reopened to visitors on the 1st of June 2024.
In German, the word "Kugel" means "ball" or "sphere"; "Mugel" is an Austrian German expression for a bump or a hill on a field, from which mogul skiing is also derived.