Rotunda or The Rotunda may refer to:

• Rotunda (architecture), any building with a circular ground plan, often covered by a dome

• Rotunda of Saint Catherine in Znojmo

• Arch of Galerius and Rotunda, Rotunda of St. George, built in Thessaloniki in 306 AD

• Rotunda Hospital, Dublin

• Rotunda of Mosta, in Mosta

• Rotunda, Edineț, a commune in Edineţ District

• Rotunda, Olt, a commune in Olt County
• Rotunda, a village in Corbeni Commune, Argeș County
• Rotunda, a village in Buza Commune, Cluj County
• Rotunda, a village in Doljești Commune, Neamț County
• Rotunda, a village administered by Liteni town, Suceava County
• Rotunda, a tributary of the Bistrița in Suceava County
• Rotunda (Lăpuș), a tributary of the Lăpuș in Maramureș County

• Rotunda, Birmingham, a cylindrical highrise building in Birmingham
• Rotunda, Woolwich, a John Nash building in Woolwich, London
• Blackfriars Rotunda (1787–1958), a building in Southwark
• The Rotunda at Ranelagh Gardens, London, a former fashionable social meeting place and function room
• Rotunda Museum, a museum of geology in Scarborough, North Yorkshire, England
• Glasgow Harbour Tunnel Rotundas, flanking the River Clyde in Scotland
• Rotunda, Aldershot, a former Methodist church in Aldershot, Hampshire

• The Rotunda (Baltimore), a mixed-use property in northern Baltimore, Maryland
• The Rotunda (Hermann, Missouri), listed on the NRHP in Missouri
• The Rotunda (New York City), a building in Manhattan 1818–1870
• The Rotunda (University of Virginia)
• The Rotunda (Longwood University)
• D'Alemberte Rotunda, on the campus of Florida State University
• Ford Rotunda, a former tourist attraction in Dearborn, Michigan
• United States Capitol rotunda, in Washington, D.C.

• "Rotunda", a song on the 1977 album Inner Voices, by McCoy Tyner
• "Rotunda", a 2011 single by Markus Schulz
• "Rotunda", a 1970 song by Tom Rush on the album Wrong End of the Rainbow
• "Rotunda", a 1996 song by Joe Morris from Elsewhere

• Kyndra Rotunda (born 1973), American legal academic
• Ronald Rotunda (born 1945), American legal academic
• Mike Rotunda (born 1958), American professional wrestler
• Bray Wyatt (Windham Rotunda; 1987–2023), American professional wrestler and son of Mike Rotunda
• Bo Dallas (Taylor Rotunda; born 1990), American professional wrestler and son of Mike Rotunda

• Rotunda (geometry), a family of dihedral-symmetric polyhedra with alternating pentagons and triangles around an axis
• Rotunda (script), a specific medieval blackletter script
• Rotunda radicals, or Rotundists, London radical reformers who gathered around the Blackfriars Rotunda in the 1830s
• A localized term for a traffic roundabout