The terms depression and depress(ed) may refer to:

• Depression (economics), an economic downturn more severe than a recession
  • The Great Depression, a severe economic depression in the 1930s
  • The Long Depression, an economic depression, starting in 1873 and sometimes dated as lasting until 1896, known at the time as the Great Depression

• Depression (meteorology), an area of low atmospheric pressure
  • Tropical depression, a class of tropical cyclone

• 'Manic Depression (song)", a song by Jimi Hendrix and covered by many artists
• "Depress", a song by Eyehategod from the album In the Name of Suffering
• "Depression", a song by Black Flag from the album Damaged

• Depression (physiology), a reduction in a biological variable or the function of an organ
• Depression (kinesiology), an anatomical term of motion

• Major depressive disorder (also known as clinical depression or major depression), a specific diagnosis from the Diagnostic and Statistical Manual of Mental Disorders by the American Psychiatric Association
  • Major depressive episode
  • Atypical depression, a cyclical sub-type of major depression where sleep, feeding and perception of pleasure are normal but there is a feeling of lethargy
  • Melancholic depression, a sub-type of major depression characterized by an inability to feel pleasure combined with physical agitation, insomnia, or decreased appetite
  • Psychotic depression, a sub-type of major depression combined with psychotic or delusional perceptions
• Depression (mood)
• Postpartum depression, a depressive episode occurring within a year of childbirth
• Dysthymia, a long-term low-grade depressive condition
• Adjustment disorder with depressed mood, previously known as "reactive depression"
• Seasonal affective disorder (SAD), a depressed mood related to the season

• Depression (geology), a sunken landform
• Depression glass, glassware that was distributed free, or at low cost, in the United States around the time of the Great Depression.