UCD can refer to:

• Universal Children's Day
• University of California, Davis
• University College Dublin
• The association football club University College Dublin A.F.C.
• The rugby union club University College Dublin RFC
• Union of the Democratic Centre, party name in various countries
• University of Colorado at Denver
• User-centered design
• The Universal Child Database, a government database in the United Kingdom.
• Uniform Call Distribution
• Unicode Character Database
• Urine collection device, a deviation used to collect urine, especially in aircraft and spacecraft
• Universal Common Descent
• Urea Cycle Disorder
• User contributed data, information supplied to a web site by a user
• Union of the Democratic Centre (Spain)
• Ultra compact dwarf, a type of dwarf galaxy

This disambiguation page lists articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to the intended article.