Dirr may refer to:
- Michael Dirr, American horticulturist
- Dirr's Trees and Shrubs for Warm Climates, sometimes abbreviated Dirr or Dirr's; see List of horticulture and gardening books/publications
 
 - Otillie Dirr, a founder of the Sisters of St. Francis of Assisi
 - dirr, an abbreviation for dwarf irregular galaxy
 
See also
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