Dirr

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