UCD can refer to:
Education University College Dublin, Irish university University College Dublin A.F.C., the university's association football club University College Dublin RFC, the university's rugby union club UCD GAA, the university Gaelic games club University of California, Davis
Science and technology User-centered design Use case diagram Urine collection device Ultra compact dwarf galaxy Unicode Character Database
Other Unión Cívica Democrática Union of the Democratic Centre (disambiguation), party name in various countries Union of the Democratic Centre (Spain) Union of the Democratic Centre (Argentina)