Category:Buildings and structures completed in the 20th century

• Airports established in the 20th century‎ (11 C)
• Amusement rides introduced in the 20th century‎ (94 C)
• Bridges completed in the 20th century‎ (11 C, 17 P)
• Commercial buildings completed in the 20th century‎ (103 C, 8 P)
• Dams completed in the 20th century‎ (10 C, 1 P)
• Energy infrastructure completed in the 20th century‎ (100 C)
• Fire stations completed in the 20th century‎ (41 C, 2 P)
• Government buildings completed in the 20th century‎ (99 C, 1 P)
• Hospital buildings completed in the 20th century‎ (100 C, 3 P)
• Houses completed in the 20th century‎ (92 C, 30 P)
• Industrial buildings completed in the 20th century‎ (78 C, 1 P)
• Infrastructure completed in the 20th century‎ (14 C, 1 P)
• Library buildings completed in the 20th century‎ (99 C, 3 P)
• Masonic buildings completed in the 20th century‎ (42 C)
• Military installations established in the 20th century‎ (11 C)
• Monuments and memorials completed in the 20th century‎ (10 C)
• Music venues completed in the 20th century‎ (100 C)
• Office buildings completed in the 20th century‎ (98 C)
• 20th-century religious buildings and structures‎ (26 C)
• Residential buildings completed in the 20th century‎ (101 C, 13 P)
• Roller coasters introduced in the 20th century‎ (78 C)
• School buildings completed in the 20th century‎ (10 C, 3 P)
• Sports venues completed in the 20th century‎ (10 C, 1 P)
• Theatres completed in the 20th century‎ (100 C, 4 P)
• Towers completed in the 20th century‎ (11 C, 1 P)
• University and college buildings completed in the 20th century‎ (78 C)

0–9

• Buildings and structures completed in the 1900s‎ (20 C, 5 P)
• Buildings and structures completed in the 1910s‎ (20 C, 2 P)
• Buildings and structures completed in the 1920s‎ (20 C, 6 P)
• Buildings and structures completed in the 1930s‎ (21 C, 16 P)
• Buildings and structures completed in the 1940s‎ (20 C, 3 P)
• Buildings and structures completed in the 1950s‎ (20 C, 10 P)
• Buildings and structures completed in the 1960s‎ (20 C, 16 P)
• Buildings and structures completed in the 1970s‎ (21 C, 1 P)
• Buildings and structures completed in the 1980s‎ (20 C)
• Buildings and structures completed in the 1990s‎ (20 C)

M

• Museums established in the 20th century‎ (11 C)

0–9

• 64 Baker Street
• 134-142 Houston Street

C

• Casco Castle
• Castello Dei Baroni

D

• Durham Miners' Hall

H

• Hulme Hall, Manchester

I

• Itamaraty Palace (Rio de Janeiro)

P

• Palace of Culture Energetik
• Laranjeiras Palace
• Presidential Palace, Grozny

R

• Rietburg Chairlift

S

• San Siro Stables

V

• Vijali Ghar

W

• West Side Elevated Highway

Z

• Palazzo Zuckermann, Padua